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      <TD align=center width="100%"><B><FONT face=serif size=2>As filed with the
        Securities and Exchange Commission on December 26, 2007</FONT></B>&nbsp;
      </TD></TR>
    <TR vAlign=bottom>
      <TD align=right width="100%"><B><FONT face=serif size=2>Registration No.
        333_____</FONT></B> </TD></TR>
    <TR>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" align=right width="100%">&nbsp;</TD></TR></TABLE><BR>
  <P align=center><B><FONT face=serif size=5>SECURITIES AND EXCHANGE
  <BR>COMMISSION<BR></FONT></B><B><FONT face=serif>Washington, D.C. 20549
  </FONT></B><FONT face=serif></FONT></P>
  <P align=center><B><FONT face=serif>_________________</FONT></B></P>
  <P align=center><B><FONT face=serif>FORM S-8 REGISTRATION STATEMENT
  <BR>UNDER<BR></FONT></B><B><FONT face=serif>THE SECURITIES ACT OF
  1933</FONT></B><FONT face=serif>
  <BR><STRONG>_________________</STRONG></FONT></P>
  <P align=center><B><FONT face=serif size=6>ENTERPRISE FINANCIAL SERVICES
  <BR>CORP<BR></FONT></B><B><FONT face=serif size=1>(Exact name of registrant as
  specified in its charter) </FONT></B><FONT face=serif></FONT></P>
  <DIV align=center>
  <TABLE cellSpacing=0 cellPadding=0 width="70%" border=0>
  
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=2>Delaware</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=2>43-1706529</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=1>(State or other
        jurisdiction</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=1>(I.R.S.
        Employer</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=1>of incorporation
        or organization)</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=1>Identification
        No.)</FONT></B> </TD></TR>
    <TR>
      <TD width="99%" colSpan=2>&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="99%" colSpan=2><B><FONT face=serif size=2>150
        North Meramec</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="99%" colSpan=2><B><FONT face=serif size=2>Clayton,
        Missouri 63105</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="99%" colSpan=2><B><FONT face=serif size=1>(Address, including zip code, and telephone number, including area
        code, of registrant&#146;s principal executive offices)</FONT></B> </TD></TR>
    <TR>
      <TD width="99%" colSpan=2>&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="99%" colSpan=2><B><FONT face=serif size=2>EFSC
        Incentive Savings Plan</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="99%" colSpan=2><B><FONT face=serif size=1>(Full
        title of the plan)</FONT></B> </TD></TR>
    <TR>
      <TD width="99%" colSpan=2>&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=left width="50%">&nbsp; </TD>
      <TD align=center width="49%"><B><FONT face=serif size=2>Copy
        to:</FONT></B> </TD></TR>
    <TR>
      <TD width="99%" colSpan=2>&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=2>Frank H.
        Sanfilippo</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=2>Charles E. H.
        Luedde, Esq.</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=2>Chief Financial
        Officer</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=2>Greensfelder
        Hemker &amp; Gale, P.C.</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=2>Enterprise
        Financial Services Corp</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=2>10 South Broadway,
        Suite 2000</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=2>150 North
        Meramec</FONT></B> </TD>
      <TD align=center width="49%"><B><FONT face=serif size=2>St. Louis,
        Missouri 63102</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=2>Clayton, Missouri
        63105</FONT></B> </TD>
      <TD align=center width="49%"><FONT face=serif size=2><STRONG>(314)
        </STRONG><STRONG>241-9090</STRONG></FONT> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><FONT face=serif size=2><STRONG>(314)
        </STRONG><STRONG>725-5500</STRONG></FONT> </TD>
      <TD align=left width="49%">&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=1>(Name, address and
        telephone number</FONT></B> </TD>
      <TD align=left width="49%">&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="50%"><B><FONT face=serif size=1>of agent for
        service)</FONT></B> </TD>
      <TD align=left width="49%">&nbsp; </TD></TR></TABLE></DIV><BR>
  <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD noWrap align=center width="99%" colSpan=9><B><FONT face=serif size=2>CALCULATION OF REGISTRATION FEE</FONT></B> </TD></TR>
    <TR>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap width="99%" colSpan=9>&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="91%">&nbsp; </TD>
      <TD noWrap align=left width="1%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=center width="1%">&nbsp; </TD>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Proposed</FONT></B> </TD>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Proposed</FONT></B> </TD>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=center width="1%">&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="91%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="1%">&nbsp; </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Maximum</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Maximum</FONT></B> </TD>
      <TD noWrap align=center width="1%">&nbsp;</TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Amount
        of</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="91%">&nbsp; </TD>
      <TD noWrap align=left width="1%">&nbsp;</TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Amount to
        be</FONT></B></TD>
      <TD noWrap align=center width="1%">&nbsp;</TD>
      <TD noWrap align=center width="1%">&nbsp;<STRONG><FONT size=2>Offering
        Price</FONT></STRONG> </TD>
      <TD noWrap align=center width="1%">&nbsp;</TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Aggregate</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Registration</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="91%"><B><FONT face=serif size=2>Title of
        Securities to be Registered</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Registered</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="1%"><FONT face=serif size=2><STRONG>Per
        Share (2)</STRONG><FONT size=3> </FONT></FONT></TD>
      <TD noWrap align=center width="1%">&nbsp;</TD>
      <TD noWrap align=center width="1%"><STRONG><FONT size=2>Offering
        Price</FONT></STRONG> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="1%"><B><FONT face=serif size=2>Fee</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="91%"><FONT face=serif size=2>Common Stock, par value $0.01 per
        share (1)</FONT> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%"><FONT face=serif size=2>200,000</FONT> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%"><FONT face=serif size=2>23.81</FONT> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%"><FONT size=2>$<FONT face=serif>4,762,000.00</FONT></FONT> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%"><FONT face=serif size=2>$146.19</FONT> </TD></TR>
    <TR>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="91%">&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt solid" noWrap align=center width="1%">&nbsp;</TD></TR></TABLE><BR>
  <HR align=center width="100%" noShade SIZE=2>
  
  <PAGE>
  <BR>
  <TABLE cellSpacing=0 cellPadding=0 border=0>
  
    <TR>
      <TD vAlign=top noWrap><FONT face=serif size=2>(1)</FONT></TD>
      <TD vAlign=top noWrap  >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD vAlign=top width="100%"><FONT face=serif size=2>pursuant to Rule
        416(c) under the Securities Act of 1933, as amended (&#147;1933 Act&#148;),
        includes, an indeterminate amount of plan participation
      interests.</FONT></TD></TR>
    <TR>
      <TD vAlign=top noWrap><FONT face=serif size=2>(2)</FONT></TD>
      <TD vAlign=top noWrap  ></TD>
      <TD vAlign=top width="100%"><FONT face=serif size=2>Estimated solely for
        the purpose of calculating the registration fee, based in accordance with
        Rule 457(h) under the 1933 Act on the average of the high and low prices
        as reported by the NASDAQ Stock Market on December 19, 2007.</FONT></TD></TR>
    <TR>
      <TD vAlign=top noWrap><FONT face=serif size=2>(3)</FONT></TD>
      <TD vAlign=top noWrap  ></TD>
      <TD vAlign=top width="100%"><FONT face=serif size=2>Pursuant to Rule
        416(a) under the 1933 Act, the number of shares registered hereunder
        includes such additional number of shares of Common Stock as are required
        to prevent dilution resulting from stock splits, stock dividends or
        similar transaction that results in an increase in the number of
        outstanding shares of Common Stock.</FONT></TD></TR>
    <TR>
      <TD width="100%" colSpan=3>&nbsp; </TD></TR></TABLE>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=center><B><FONT face=serif size=2>Part I </FONT></B></P>
  <P align=justify><FONT face=serif size=2>Omitted pursuant to the Note to Part I
  of form S-8. </FONT></P>
  <P align=center><B><FONT face=serif size=2>Part II </FONT></B></P>
  <P align=left><B><FONT face=serif size=2>Item 3.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Incorporation of Documents by
  Reference</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>The following documents are hereby
  incorporated by reference: </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(1) the
  Annual Report on form 10-K of Enterprise Financial Services Corp (the
  &#147;Corporation&#148;) filed with the Securities and Exchange Commission (the
  &#147;Commission&#148;) for the year ended December 31, 2006; </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(2) the
  Quarterly Report on Form 10-Q of the Corporation filed with the Commission for
  the quarter ended March 31, 2007; </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(3) the
  Quarterly Report on Form 10-Q of the Corporation filed with the Commission for
  the quarter ended June 30, 2007; </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(4) the
  Quarterly Report on Form 10-Q of the Corporation filed with the Commission for
  the quarter ended September 30, 2007; </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(5) all
  other reports filed by the Corporation with the Commission pursuant to Section
  13(a) or Section 14(d) of the Securities Exchange Act of 1934, as amended (the
  &#147;Exchange Act&#148;) since December 31, 2006, including without limitation all
  Current Reports on Form 8-K filed by the Corporation with the Commission since
  such date; and </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(6) the
  description of the shares of the Corporation&#146;s common stock, par value $0.01 per
  share (&#147;Common Stock&#148;) contained in the Corporation&#146;s Registration Statement
  filed with the Commission pursuant to Section 12 of the Exchange Act, including
  any amendment or report subsequently filed for the purpose of updated that
  description. </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>All
  documents filed by the Corporation pursuant to Sections 13(a), 13(c), 14 or
  15(d) of the Exchange Act subsequent to the date of this Registration Statement,
  prior to the filing of a post-effective amendment which indicates that all
  securities offered have been sold or which deregisters all securities then
  remaining unsold, shall be deemed to be incorporated by reference in this
  Registration Statement and to be a part hereof from the date of filing of such
  documents. Any statement contained in this Registration Statement or in a
  document incorporated or deemed to be incorporated by reference herein shall be
  deemed to be modified or superseded for purposes of this Registration Statement
  to the extent that a statement contained herein or incorporated herein by
  reference or in any subsequently filed document which is deemed to be
  incorporated by reference herein modifies or supersedes such statement. Any such
  statement so modified or superseded shall not be deemed, except as so modified
  or superseded, to constitute a part of this Registration Statement. </FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=left><B><FONT face=serif size=2>Item 4.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Description of
  Securities.</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>Not applicable.</FONT></P>
  <P align=left><B><FONT face=serif size=2>Item 5.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Interest of Named Experts and
  Counsel.</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>Not applicable. </FONT></P>
  <P align=left><B><FONT face=serif size=2>Item 6.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Indemnification of Directors and
  Officers</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Section 102
  of the Delaware General Corporation Law, as amended (the &#147;DGCL&#148;), allows a
  corporation to eliminate the personal liability of directors of a corporation or
  its stockholders for monetary damages for breach of fiduciary duty as a
  director, except where the director breached the duty of loyalty, failed to act
  in good faith, engaged in intentional misconduct or knowingly violated a law,
  authorized the payment of a dividend or approved a stock repurchase in violation
  of the DGCL or obtained an improper personal benefit.</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Section 145
  of the DGCL provides, among other things, that the Corporation may indemnify any
  person who was or is a party or is threatened to be made a party to any
  threatened, pending or completed action, suit or proceeding other than an action
  by or in the right of the Corporation, by reason of the fact that the person is
  or was a director, officer, agent or employee of the Corporation, or is or was
  serving at the Corporation&#146;s request as a director, officer, agent or employee
  of another corporation, partnership, joint venture, trust or other enterprise,
  against expenses, including attorneys&#146; fees, judgments, fines and amounts paid
  in settlement actually and reasonably incurred by the person in connection with
  such action, suit or proceeding, if such person acting in good faith and in a
  manner he or she reasonably believed to be in the best interests, or not opposed
  to the best interests, of the Corporation, and with respect to any criminal
  action or proceeding had no reasonable cause to believe his or her conduct was
  unlawful. The power to indemnify applies to actions brought by or in the right
  of the Corporation as well, but only to the extent of defense expenses,
  reasonably incurred and not to any satisfaction of judgment or settlement of the
  claim itself, and with the further limitation that in such actions no
  indemnification shall be made in the event of any adjudication of liability to
  the Corporation, unless the court believes that in light of all the
  circumstances indemnification should apply. Furthermore, under the DGCL, if such
  person is successfully on the merits or otherwise in the defense of any action
  referred to above, or in the defense of any claim, issue or matter therein, such
  person shall be indemnified against expenses (including attorneys&#146; fees)
  actually and reasonably incurred by such person in connection
  therewith.</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Section 174
  of the DGCL provides, among other things, that a director, who willfully or
  negligently approves an unlawful payment of dividends or an unlawful purchase or
  redemption of stock, may be held liable for such actions. A director who was
  either absent when the unlawful actions were approved or dissented at the time,
  may avoid liability by causing his or her dissent to such actions to be entered
  in the books containing minutes of the meetings of the board of directors at the
  time such action occurred or immediately after such absent director receives
  notice of the unlawful acts.</FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>As permitted
  by the DGCL, the Corporation&#146;s certificate of incorporation includes a provision
  to eliminate the personal liability of its directors for monetary damages for
  breach of alleged breach of their fiduciary duties as directors, subject to
  limited exceptions. The certificate of incorporation also provides that every
  person who is or was our director, officer, employee or agent or is or was a
  director, officer, trustee, employee or agent of any other enterprise, serving
  as such at the Corporation&#146;s request, shall be indemnified to the fullest extent
  permitted by law for all expenses and liabilities in connection with any
  proceeding involving such person in this capacity.</FONT></P>
  <P align=left><B><FONT face=serif size=2>Item 7.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Exemption from Registration
  Claimed.</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>Not applicable. </FONT></P>
  <P align=left><B><FONT face=serif size=2>Item 8.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Exhibits.</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>The Exhibits
  to this registration statement are listed in the Index to Exhibits which
  immediately follows the signature pages hereto. </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Pursuant to
  the instructions to Form S-8 under Item 8, no opinion of counsel as to the
  legality of the securities being registered is being furnished because no
  original issue shares are being registered under this Registration
  Statement.</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>The
  Corporation has received a determination letter from the Internal Revenue
  Service that the Plan is a qualified plan under the Internal Revenue Code of
  1986, as amended (the &#147;Code&#148;). The Corporation hereby undertakes to submit any
  amendments to the Plan to the Internal Revenue Service in a timely manner and
  will make all changes required under the Code to maintain the tax qualification
  of the Plan.</FONT></P>
  <P align=left><B><FONT face=serif size=2>Item 9.</FONT></B><FONT face=serif size=2> </FONT><B><U><FONT face=serif size=2>Undertakings.</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <P align=left><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>The Registrant hereby
  undertakes:</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(a) To file,
  during any period in which offers or sales are being made, a post-effective
  amendment to this registration statement to:</FONT></P>
  <P align=left><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>(i) to
  include any prospectus required by Section 10(a)(3) of the Securities Act;
  </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(ii) to reflect in the prospectus any facts or event arising
  after the effective date of this registration statement (or the most recent
  post-effective amendment thereof) which, individually or in the aggregate,
  represent a fundamental change in the information set forth in this registration
  statement; and </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(iii) include any material information with respect to the
  plan of distribution not previously disclosed in the registration statement or
  any material change to such information in the registration
  statement.</FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(b) That,
  for the purpose of determining any liability under the Securities Act, each such
  post-effective amendment shall be deemed to be a new registration statement
  relating to the securities offered therein, and the offering of such securities
  at that time shall be deemed to be the initial bona fide offering
  thereof.</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(c) To
  remove from registration by means of a post-effective amendment any of the
  securities being registered which remain unsold at the termination of the
  offering.</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>The
  Corporation hereby undertakes that, for purposes of determining any liability
  under the Securities Act, each filing of the registrant&#146;s annual report pursuant
  to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable,
  each filing of an employee benefit plan&#146;s annual report pursuant to Section
  15(d) of the Exchange Act) that is incorporated by reference in the registration
  statement shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that time
  shall be deemed to be the initial bona file offering thereof.</FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Insofar as
  indemnification for liabilities arising under the Securities Act may be
  permitted to directors, officers and controlling persons of the Registrant
  pursuant to the foregoing provisions, or otherwise, the registrant has been
  advised that in the opinion of the Commission such indemnification is against
  public policy as expressed in the Securities Act and is, therefore,
  unenforceable. In the event that a claim for indemnification against such
  liabilities (other than the payment by the Registrant of expenses incurred or
  paid by a director, officer, or controlling person of the registrant in the
  successful defense of any action, suit or proceeding) is asserted by such
  director, officer or controlling person in connection with the securities being
  registered, the Registrant will, unless in the opinion of its counsel the matter
  has been settled by controlling precedent, submit to a court of appropriate
  jurisdiction the question whether such indemnification by it is against public
  policy as expressed in the Securities Act and will be governed by the final
  adjudication of such issue. </FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=center><B><FONT face=serif size=2>SIGNATURES</FONT></B><FONT face=serif size=2> </FONT></P>
  <P align=left>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Pursuant to
  the requirements of the Securities Act of 1933, as amended, the registrant
  certifies that it has reasonable grounds to believe that it meets all the
  requirements for filing on Form S-8 and has duly caused this Registration
  Statement to be signed on its behalf by the undersigned, thereunto duly
  authorized, in the County of St. Louis, State of Missouri, on December 12,
  2007.</FONT></P>
  <DIV align=right>
  <TABLE cellSpacing=0 cellPadding=0 width="50%" border=0>
  
    <TR vAlign=bottom>
      <TD align=left width="99%" colSpan=2><B><FONT face=serif size=2>ENTERPRISE
        FINANCIAL SERVICES CORP</FONT></B>&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=2>&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=2>&nbsp; </TD></TR>
    <TR style="PADDING-BOTTOM: 6pt" vAlign=bottom>
      <TD align=left width="1%"><FONT face=serif size=2>By:</FONT>&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" align=left width="98%"><FONT face=serif size=2>/s/ Frank H. Sanfilippo</FONT>&nbsp; </TD></TR>
    <TR>
      <TD align=left width="1%"></TD>
      <TD align=left width="98%"><FONT size=2>Frank H. Sanfilippo</FONT> </TD></TR>
    <TR vAlign=bottom>
      <TD align=left width="1%">&nbsp; </TD>
      <TD align=left width="98%"><FONT face=serif size=2>Chief Financial
        Officer</FONT>&nbsp; </TD></TR></TABLE>
  </DIV><BR>
  <P align=center><B><FONT face=serif size=2>POWER OF ATTORNEY </FONT></B></P>
  <P align=left><FONT face=serif size=2>We, the undersigned directors and officers
  of Enterprise Financial Services Corp (the &#147;Company&#148;) and each of us, do hereby
  constitute and appoint Kevin C. Eichner and Frank H. Sanfilippo, or either of
  them, our true and lawful attorneys-in-fact and agents, each with full power of
  substitution and resubstitution, to do any and all acts and things in our names
  and on our behalf in our capacities as directors and officers and to execute any
  and all instruments for us and in our names in the capacities indicated above,
  which said attorneys or agents, or either of them, may deem necessary or
  advisable to enable the Company to comply with the Securities Act of 1933, as
  amended, and any rules, regulations and amendments (including post-effective
  amendments) to the Registration Statement, including specifically but without
  limitation, power and authority to sign for us or any of us in our names in the
  capacities indicated below, any and all amendments (including post-effective
  amendments) to such Registration Statement; and we do hereby ratify and conform
  all that the said attorneys and agents, or their substitute or substitutes, or
  either of them, shall do or cause to be done by virtue hereof.</FONT></P>
  
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <BR>
  
  <P align=justify><FONT face=serif size=2>Pursuant to the requirements of the
  Securities Act of 1933, this registration statement has been signed by the
  following persons in the capacities and on the dates indicated:</FONT></P>
  
  
  <TABLE style="LINE-HEIGHT: 14pt" cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" align=center width="29%"><B><FONT face=serif size=2>Signature</FONT></B> </TD>
      <TD align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" align=center width="39%"><B><FONT face=serif size=2>Title</FONT></B> </TD>
      <TD align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" align=center width="29%"><B><FONT face=serif size=2>Date</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" align=left width="29%"><FONT size=2>/s/ Peter F. Benoist</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD align=left width="1%">&nbsp;</TD>
      <TD align=center width="39%"><FONT face=serif size=2>Executive Vice President
        and</FONT>&nbsp; </TD>
      <TD align=center width="1%"></TD>
      <TD align=center width="29%"><FONT face=serif size=2>December 12, 2007</FONT>&nbsp;
    </TD></TR>
    <TR vAlign=bottom>
      <TD align=left width="29%"><FONT face=serif size=2>Peter F. Benoist</FONT>&nbsp; </TD>
      <TD align=left width="1%"></TD>
      <TD align=center width="39%"><FONT face=serif size=2>Chairman of the Board of
        Directors</FONT>&nbsp; </TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" align=left width="29%"><FONT size=2>/s/ Kevin C. Eichner</FONT>&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD align=left width="1%"></TD>
      <TD align=center width="39%"><FONT face=serif size=2>Chief Executive Officer and
        Director</FONT>&nbsp; </TD>
      <TD align=center width="1%"></TD>
      <TD align=center width="29%"><FONT face=serif size=2>December 12, 2007</FONT>&nbsp;
    </TD></TR>
    <TR vAlign=bottom>
      <TD align=left width="29%"><FONT face=serif size=2>Kevin C. Eichner</FONT>&nbsp; </TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="39%">&nbsp; </TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="29%">&nbsp; </TD></TR>
  
  
    <TR>
      <TD noWrap align=left width="29%">&nbsp;</TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"></TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"></TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>William H. Downey</FONT> &nbsp;</TD>
      <TD noWrap align=left width="1%">&nbsp;</TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%">&nbsp;</TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>William H.
        Downey</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD noWrap align=left width="29%">&nbsp;</TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"></TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"></TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Robert E. Guest, Jr.</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Robert E. Guest,
        Jr.</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD noWrap align=left width="29%">&nbsp;</TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"></TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"></TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Lewis A. Levey</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Lewis A.
        Levey</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD noWrap align=left width="29%">&nbsp;</TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"></TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"></TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Birch M. Mullins</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Birch M.
        Mullins</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%">&nbsp;</TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>James J. Murphy</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>James J.
        Murphy</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Robert E. Saur</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Robert E.
        Saur</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Sandra Van Trease</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Sandra Van
        Trease</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Henry D. Warshaw</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Henry D.
        Warshaw</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT size=2>/s/</FONT><FONT size=3> </FONT><FONT size=2>Michael A. DeCola</FONT>&nbsp;&nbsp;&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Michael A.
        DeCola</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp; </TD></TR>
    <TR>
      <TD width="99%" colSpan=5>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="PADDING-BOTTOM: 6pt; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="29%"><FONT face=serif size=2>/s/<FONT size=3> </FONT>Brenda D.
        Newberry</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%"><FONT face=serif size=2>December 12,
        2007</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="29%"><FONT face=serif size=2>Brenda D.
        Newberry</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="39%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=center width="29%">&nbsp;
  </TD></TR></TABLE>
  
  
  <BR>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=left><FONT face=serif size=2>Pursuant to the requirements of the
  Securities Act of 1933, the Administrator of the Enterprise Financial Services
  Corp Incentive Savings Plan has duly caused this Registration Statement to be
  signed on its behalf by the undersigned, thereunto duly authorized in the County
  of St. Louis, State of Missouri on December 12, 2007. </FONT></P>
  <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD align=left width="59%"  ></TD>
      <TD align=left width="40%" colSpan=2><B><FONT face=serif size=2>ENTERPRISE
        FINANCIAL SERVICES</FONT></B>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=left width="59%"  ></TD>
      <TD align=left width="40%" colSpan=2><B><FONT face=serif size=2>CORP
        INCENTIVE SAVINGS PLAN</FONT></B>&nbsp; </TD></TR>
    <TR>
      <TD width="59%"  ></TD>
      <TD width="40%" colSpan=2>&nbsp; </TD></TR>
    <TR style="PADDING-BOTTOM: 6pt" vAlign=bottom>
      <TD align=left width="59%"  ></TD>
      <TD noWrap align=left width="1%"><FONT face=serif size=2>By:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT>&nbsp; &nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" align=left width="39%"><FONT face=serif size=2>/s/ Mark Murtha</FONT>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD align=left width="59%"  ></TD>
      <TD align=left width="1%">&nbsp; </TD>
      <TD align=left width="39%"><FONT face=serif size=2>Mark Murtha, Sr. Vice
        President</FONT>&nbsp; </TD></TR>
    <TR>
      <TD align=left width="59%"  ></TD>
      <TD align=left width="1%"  ></TD>
      <TD align=left width="39%"  ><FONT size=2>Human
        Resources</FONT> </TD></TR>
    <TR vAlign=bottom>
      <TD align=center width="59%"  ></TD>
      <TD align=center width="40%" colSpan=2></TD></TR></TABLE><BR>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=center><B><U><FONT face=serif size=2>INDEX TO
  EXHIBITS</FONT></U></B><FONT face=serif size=2> </FONT></P>
  <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR style="PADDING-BOTTOM: 6pt" vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" vAlign=top align=left width="15%"><B><FONT face=serif size=1>Exhibit No.</FONT></B> </TD>
      <TD vAlign=top noWrap align=right width="1%">&nbsp;&nbsp;&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" vAlign=top align=left width="84%"><B><FONT face=serif size=1>Description</FONT></B>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>3.1*</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Certificate of Incorporation of the Registrant, (incorporated
        herein by reference to Exhibit 3.1 of the Registrant&#146;s Registration
        Statement on Form S-1 dated December 19, 1996 (File No.
      333-14737)).</FONT></TD></TR>
    <TR>
      <TD vAlign=top align=left width="100%" colSpan=3>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>3.2*</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Amendment to the Certificate of Incorporation of the Registrant
        (incorporated herein by reference to Exhibit 4.2 to the Registrant&#146;s
        Registration Statement on Form S-8 dated July 1, 1999 (File No.
        33382087)).</FONT></TD></TR>
    <TR>
      <TD vAlign=top align=left width="100%" colSpan=3>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>3.3*</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Amendment to the Certificate of Incorporation of the Registrant
        (incorporated herein by reference to Exhibit 3.1 of the Registrant&#146;s
        Quarterly Report on Form 10-Q for the period ending September 30,
        1999).</FONT></TD></TR>
    <TR>
      <TD vAlign=top align=left width="100%" colSpan=3>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>3.4*</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Amendment to the Certificate of Incorporation of the Registrant
        (incorporated herein by reference to Exhibit 99.2 to the Registrant&#146;s
        Current Report on Form 8-K filed on April 30, 2002).</FONT></TD></TR>
    <TR>
      <TD vAlign=top align=left width="100%" colSpan=3>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>3.5*</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Bylaws of the Registrant, as amended, (incorporated herein by
        reference to Exhibit 3.1 to the Registrant&#146;s Current Report on Form 8-K
        filed on October 2, 2007).</FONT></TD></TR>
    <TR>
      <TD vAlign=top align=left width="100%" colSpan=3>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>23.1**</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Consent of Independent Registered Public Accounting
    Firm</FONT></TD></TR>
    <TR>
      <TD vAlign=top align=left width="100%" colSpan=3>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top align=left width="15%" bgColor=#c0c0c0><FONT face=serif size=2>24.1</FONT></TD>
      <TD vAlign=top align=right width="1%" bgColor=#c0c0c0>&nbsp;</TD>
      <TD vAlign=top align=left width="84%" bgColor=#c0c0c0><FONT face=serif size=2>Power of Attorney (included on signature page
    above)</FONT></TD></TR></TABLE>
  <BR>
  <P align=justify><FONT face=serif size=2>*&nbsp;&nbsp; Previously Filed<BR>** Filed herewith
  </FONT></P>
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metadata_documents: [{"type": "S-8", "sequence": "1", "filename": "enterprisesavingsplan_s-8.htm", "description": "INITIAL STATEMENT", "secsgml_size_bytes": 47008}]
metadata_filer: {"company-data": {"conformed-name": "ENTERPRISE FINANCIAL SERVICES CORP", "cik": "0001025835", "assigned-sic": "6022", "irs-number": "431706259", "state-of-incorporation": "DE", "fiscal-year-end": "0907"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-148328", "film-number": "071326258"}, "business-address": {"street1": "150 NORTH MERAMEC", "street2": "150 NORTH MERAMEC", "city": "CLAYTON", "state": "MO", "zip": "63105", "phone": "3147255500"}, "mail-address": {"street1": "150 NORTH MERAMEC", "street2": "150 NORTH MERAMEC", "city": "CLAYTON", "state": "MO", "zip": "63105"}, "former-company": {"former-conformed-name": "ENTERBANK HOLDINGS INC", "date-changed": "19961024"}}
text: As filed with the
        Securities and Exchange Commission on December 26, 2007
  Registration No.
        333_____
  SECURITIES AND EXCHANGE
  COMMISSION
  Washington, D.C. 20549
  _________________
  FORM S-8 REGISTRATION STATEMENT
  UNDER
  THE SECURITIES ACT OF
  1933
  _________________
  ENTERPRISE FINANCIAL SERVICES
  CORP
  (Exact name of registrant as
  specified in its charter)
  Delaware
  43-1706529
  (State or other
        jurisdiction
  (I.R.S.
        Employer
  of incorporation
        or organization)
  Identification
        No.)
  150
        North Meramec
  Clayton,
        Missouri 63105
  (Address, including zip code, and telephone number, including area
        code, of registrant's principal executive offices)
  EFSC
        Incentive Savings Plan
  (Full
        title of the plan)
  Copy
        to:
  Frank H.
        Sanfilippo
  Charles E. H.
        Luedde, Esq.
  Chief Financial
        Officer
  Greensfelder
        Hemker & Gale, P.C.
  Enterprise
        Financial Services Corp
  10 South Broadway,
        Suite 2000
  150 North
        Meramec
  St. Louis,
        Missouri 63102
  Clayton, Missouri
        63105
  (314)
  241-9090
  (314)
  725-5500
  (Name, address and
        telephone number
  of agent for
        service)
  CALCULATION OF REGISTRATION FEE
  Proposed
  Proposed
  Maximum
  Maximum
  Amount
        of
  Amount to
        be
  Offering
        Price
  Aggregate
  Registration
  Title of
        Securities to be Registered
  Registered
  Per
        Share (2)
  Offering
        Price
  Fee
  Common Stock, par value $0.01 per
        share (1)
  200,000
  23.81
  $
  4,762,000.00
  $146.19
  (1)
  pursuant to Rule
        416(c) under the Securities Act of 1933, as amended ("1933 Act"),
        includes, an indeterminate amount of plan participation
      interests.
  (2)
  Estimated solely for
        the purpose of calculating the registration fee, based in accordance with
        Rule 457(h) under the 1933 Act on the average of the high and low prices
        as reported by the NASDAQ Stock Market on December 19, 2007.
  (3)
  Pursuant to Rule
        416(a) under the 1933 Act, the number of shares registered hereunder
        includes such additional number of shares of Common Stock as are required
        to prevent dilution resulting from stock splits, stock dividends or
        similar transaction that results in an increase in the number of
        outstanding shares of Common Stock.
  Part I
  Omitted pursuant to the Note to Part I
  of form S-8.
  Part II
  Item 3.
  Incorporation of Documents by
  Reference
  The following documents are hereby
  incorporated by reference:
  (1) the
  Annual Report on form 10-K of Enterprise Financial Services Corp (the
  "Corporation") filed with the Securities and Exchange Commission (the
  "Commission") for the year ended December 31, 2006;
  (2) the
  Quarterly Report on Form 10-Q of the Corporation filed with the Commission for
  the quarter ended March 31, 2007;
  (3) the
  Quarterly Report on Form 10-Q of the Corporation filed with the Commission for
  the quarter ended June 30, 2007;
  (4) the
  Quarterly Report on Form 10-Q of the Corporation filed with the Commission for
  the quarter ended September 30, 2007;
  (5) all
  other reports filed by the Corporation with the Commission pursuant to Section
  13(a) or Section 14(d) of the Securities Exchange Act of 1934, as amended (the
  "Exchange Act") since December 31, 2006, including without limitation all
  Current Reports on Form 8-K filed by the Corporation with the Commission since
  such date; and
  (6) the
  description of the shares of the Corporation's common stock, par value $0.01 per
  share ("Common Stock") contained in the Corporation's Registration Statement
  filed with the Commission pursuant to Section 12 of the Exchange Act, including
  any amendment or report subsequently filed for the purpose of updated that
  description.
  All
  documents filed by the Corporation pursuant to Sections 13(a), 13(c), 14 or
  15(d) of the Exchange Act subsequent to the date of this Registration Statement,
  prior to the filing of a post-effective amendment which indicates that all
  securities offered have been sold or which deregisters all securities then
  remaining unsold, shall be deemed to be incorporated by reference in this
  Registration Statement and to be a part hereof from the date of filing of such
  documents. Any statement contained in this Registration Statement or in a
  document incorporated or deemed to be incorporated by reference herein shall be
  deemed to be modified or superseded for purposes of this Registration Statement
  to the extent that a statement contained herein or incorporated herein by
  reference or in any subsequently filed document which is deemed to be
  incorporated by reference herein modifies or supersedes such statement. Any such
  statement so modified or superseded shall not be deemed, except as so modified
  or superseded, to constitute a part of this Registration Statement.
  Item 4.
  Description of
  Securities.
  Not applicable.
  Item 5.
  Interest of Named Experts and
  Counsel.
  Not applicable.
  Item 6.
  Indemnification of Directors and
  Officers
  Section 102
  of the Delaware General Corporation Law, as amended (the "DGCL"), allows a
  corporation to eliminate the personal liability of directors of a corporation or
  its stockholders for monetary damages for breach of fiduciary duty as a
  director, except where the director breached the duty of loyalty, failed to act
  in good faith, engaged in intentional misconduct or knowingly violated a law,
  authorized the payment of a dividend or approved a stock repurchase in violation
  of the DGCL or obtained an improper personal benefit.
  Section 145
  of the DGCL provides, among other things, that the Corporation may indemnify any
  person who was or is a party or is threatened to be made a party to any
  threatened, pending or completed action, suit or proceeding other than an action
  by or in the right of the Corporation, by reason of the fact that the person is
  or was a director, officer, agent or employee of the Corporation, or is or was
  serving at the Corporation's request as a director, officer, agent or employee
  of another corporation, partnership, joint venture, trust or other enterprise,
  against expenses, including attorneys' fees, judgments, fines and amounts paid
  in settlement actually and reasonably incurred by the person in connection with
  such action, suit or proceeding, if such person acting in good faith and in a
  manner he or she reasonably believed to be in the best interests, or not opposed
  to the best interests, of the Corporation, and with respect to any criminal
  action or proceeding had no reasonable cause to believe his or her conduct was
  unlawful. The power to indemnify applies to actions brought by or in the right
  of the Corporation as well, but only to the extent of defense expenses,
  reasonably incurred and not to any satisfaction of judgment or settlement of the
  claim itself, and with the further limitation that in such actions no
  indemnification shall be made in the event of any adjudication of liability to
  the Corporation, unless the court believes that in light of all the
  circumstances indemnification should apply. Furthermore, under the DGCL, if such
  person is successfully on the merits or otherwise in the defense of any action
  referred to above, or in the defense of any claim, issue or matter therein, such
  person shall be indemnified against expenses (including attorneys' fees)
  actually and reasonably incurred by such person in connection
  therewith.
  Section 174
  of the DGCL provides, among other things, that a director, who willfully or
  negligently approves an unlawful payment of dividends or an unlawful purchase or
  redemption of stock, may be held liable for such actions. A director who was
  either absent when the unlawful actions were approved or dissented at the time,
  may avoid liability by causing his or her dissent to such actions to be entered
  in the books containing minutes of the meetings of the board of directors at the
  time such action occurred or immediately after such absent director receives
  notice of the unlawful acts.
  As permitted
  by the DGCL, the Corporation's certificate of incorporation includes a provision
  to eliminate the personal liability of its directors for monetary damages for
  breach of alleged breach of their fiduciary duties as directors, subject to
  limited exceptions. The certificate of incorporation also provides that every
  person who is or was our director, officer, employee or agent or is or was a
  director, officer, trustee, employee or agent of any other enterprise, serving
  as such at the Corporation's request, shall be indemnified to the fullest extent
  permitted by law for all expenses and liabilities in connection with any
  proceeding involving such person in this capacity.
  Item 7.
  Exemption from Registration
  Claimed.
  Not applicable.
  Item 8.
  Exhibits.
  The Exhibits
  to this registration statement are listed in the Index to Exhibits which
  immediately follows the signature pages hereto.
  Pursuant to
  the instructions to Form S-8 under Item 8, no opinion of counsel as to the
  legality of the securities being registered is being furnished because no
  original issue shares are being registered under this Registration
  Statement.
  The
  Corporation has received a determination letter from the Internal Revenue
  Service that the Plan is a qualified plan under the Internal Revenue Code of
  1986, as amended (the "Code"). The Corporation hereby undertakes to submit any
  amendments to the Plan to the Internal Revenue Service in a timely manner and
  will make all changes required under the Code to maintain the tax qualification
  of the Plan.
  Item 9.
  Undertakings.
  The Registrant hereby
  undertakes:
  (a) To file,
  during any period in which offers or sales are being made, a post-effective
  amendment to this registration statement to:
  (i) to
  include any prospectus required by Section 10(a)(3) of the Securities Act;
  (ii) to reflect in the prospectus any facts or event arising
  after the effective date of this registration statement (or the most recent
  post-effective amendment thereof) which, individually or in the aggregate,
  represent a fundamental change in the information set forth in this registration
  statement; and
  (iii) include any material information with respect to the
  plan of distribution not previously disclosed in the registration statement or
  any material change to such information in the registration
  statement.
  (b) That,
  for the purpose of determining any liability under the Securities Act, each such
  post-effective amendment shall be deemed to be a new registration statement
  relating to the securities offered therein, and the offering of such securities
  at that time shall be deemed to be the initial bona fide offering
  thereof.
  (c) To
  remove from registration by means of a post-effective amendment any of the
  securities being registered which remain unsold at the termination of the
  offering.
  The
  Corporation hereby undertakes that, for purposes of determining any liability
  under the Securities Act, each filing of the registrant's annual report pursuant
  to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable,
  each filing of an employee benefit plan's annual report pursuant to Section
  15(d) of the Exchange Act) that is incorporated by reference in the registration
  statement shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that time
  shall be deemed to be the initial bona file offering thereof.
  Insofar as
  indemnification for liabilities arising under the Securities Act may be
  permitted to directors, officers and controlling persons of the Registrant
  pursuant to the foregoing provisions, or otherwise, the registrant has been
  advised that in the opinion of the Commission such indemnification is against
  public policy as expressed in the Securities Act and is, therefore,
  unenforceable. In the event that a claim for indemnification against such
  liabilities (other than the payment by the Registrant of expenses incurred or
  paid by a director, officer, or controlling person of the registrant in the
  successful defense of any action, suit or proceeding) is asserted by such
  director, officer or controlling person in connection with the securities being
  registered, the Registrant will, unless in the opinion of its counsel the matter
  has been settled by controlling precedent, submit to a court of appropriate
  jurisdiction the question whether such indemnification by it is against public
  policy as expressed in the Securities Act and will be governed by the final
  adjudication of such issue.
  SIGNATURES
  Pursuant to
  the requirements of the Securities Act of 1933, as amended, the registrant
  certifies that it has reasonable grounds to believe that it meets all the
  requirements for filing on Form S-8 and has duly caused this Registration
  Statement to be signed on its behalf by the undersigned, thereunto duly
  authorized, in the County of St. Louis, State of Missouri, on December 12,
  2007.
  ENTERPRISE
        FINANCIAL SERVICES CORP
  By:
  /s/ Frank H. Sanfilippo
  Frank H. Sanfilippo
  Chief Financial
        Officer
  POWER OF ATTORNEY
  We, the undersigned directors and officers
  of Enterprise Financial Services Corp (the "Company") and each of us, do hereby
  constitute and appoint Kevin C. Eichner and Frank H. Sanfilippo, or either of
  them, our true and lawful attorneys-in-fact and agents, each with full power of
  substitution and resubstitution, to do any and all acts and things in our names
  and on our behalf in our capacities as directors and officers and to execute any
  and all instruments for us and in our names in the capacities indicated above,
  which said attorneys or agents, or either of them, may deem necessary or
  advisable to enable the Company to comply with the Securities Act of 1933, as
  amended, and any rules, regulations and amendments (including post-effective
  amendments) to the Registration Statement, including specifically but without
  limitation, power and authority to sign for us or any of us in our names in the
  capacities indicated below, any and all amendments (including post-effective
  amendments) to such Registration Statement; and we do hereby ratify and conform
  all that the said attorneys and agents, or their substitute or substitutes, or
  either of them, shall do or cause to be done by virtue hereof.
  Pursuant to the requirements of the
  Securities Act of 1933, this registration statement has been signed by the
  following persons in the capacities and on the dates indicated:
  Signature
  Title
  Date
  /s/ Peter F. Benoist
  Executive Vice President
        and
  December 12, 2007
  Peter F. Benoist
  Chairman of the Board of
        Directors
  /s/ Kevin C. Eichner
  Chief Executive Officer and
        Director
  December 12, 2007
  Kevin C. Eichner
  /s/
  William H. Downey
  Director
  December 12,
        2007
  William H.
        Downey
  /s/
  Robert E. Guest, Jr.
  Director
  December 12,
        2007
  Robert E. Guest,
        Jr.
  /s/
  Lewis A. Levey
  Director
  December 12,
        2007
  Lewis A.
        Levey
  /s/
  Birch M. Mullins
  Director
  December 12,
        2007
  Birch M.
        Mullins
  /s/
  James J. Murphy
  Director
  December 12,
        2007
  James J.
        Murphy
  /s/
  Robert E. Saur
  Director
  December 12,
        2007
  Robert E.
        Saur
  /s/
  Sandra Van Trease
  Director
  December 12,
        2007
  Sandra Van
        Trease
  /s/
  Henry D. Warshaw
  Director
  December 12,
        2007
  Henry D.
        Warshaw
  /s/
  Michael A. DeCola
  Director
  December 12,
        2007
  Michael A.
        DeCola
  /s/
  Brenda D.
        Newberry
  Director
  December 12,
        2007
  Brenda D.
        Newberry
  Pursuant to the requirements of the
  Securities Act of 1933, the Administrator of the Enterprise Financial Services
  Corp Incentive Savings Plan has duly caused this Registration Statement to be
  signed on its behalf by the undersigned, thereunto duly authorized in the County
  of St. Louis, State of Missouri on December 12, 2007.
  ENTERPRISE
        FINANCIAL SERVICES
  CORP
        INCENTIVE SAVINGS PLAN
  By:
  /s/ Mark Murtha
  Mark Murtha, Sr. Vice
        President
  Human
        Resources
  INDEX TO
  EXHIBITS
  Exhibit No.
  Description
  3.1*
  Certificate of Incorporation of the Registrant, (incorporated
        herein by reference to Exhibit 3.1 of the Registrant's Registration
        Statement on Form S-1 dated December 19, 1996 (File No.
      333-14737)).
  3.2*
  Amendment to the Certificate of Incorporation of the Registrant
        (incorporated herein by reference to Exhibit 4.2 to the Registrant's
        Registration Statement on Form S-8 dated July 1, 1999 (File No.
        33382087)).
  3.3*
  Amendment to the Certificate of Incorporation of the Registrant
        (incorporated herein by reference to Exhibit 3.1 of the Registrant's
        Quarterly Report on Form 10-Q for the period ending September 30,
        1999).
  3.4*
  Amendment to the Certificate of Incorporation of the Registrant
        (incorporated herein by reference to Exhibit 99.2 to the Registrant's
        Current Report on Form 8-K filed on April 30, 2002).
  3.5*
  Bylaws of the Registrant, as amended, (incorporated herein by
        reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K
        filed on October 2, 2007).
  23.1**
  Consent of Independent Registered Public Accounting
    Firm
  24.1
  Power of Attorney (included on signature page
    above)
  *   Previously Filed
  ** Filed herewith