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<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">SECURITIES AND EXCHANGE COMMISSION</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">WASHINGTON, D.C. 20549</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">FORM 8-K</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">CURRENT REPORT PURSUANT</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">TO SECTION 13 OR 15(d) OF
THE</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">SECURITIES EXCHANGE ACT OF
1934</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">April 20, 2012</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">Date of Report (Date of earliest
event reported)</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif"><B>UNITED SECURITY BANCSHARES</B></P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">(Exact Name of Registrant
as Specified in its Charter)</P>

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<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">California</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">(State or Other Jurisdiction
of Incorporation)</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; font-size: 10pt">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 37%; text-align: center; text-indent: 0pt">000-32987</TD>
    <TD STYLE="width: 37%; text-align: center; text-indent: 0pt">91-2112732</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; text-indent: 0pt">(Commission</TD>
    <TD STYLE="text-align: center; text-indent: 0pt">(IRS Employer</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; text-indent: 0pt">File Number)</TD>
    <TD STYLE="text-align: center; text-indent: 0pt">Identification No.)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; text-indent: 0pt">2126 Inyo Street, Fresno, CA</TD>
    <TD STYLE="text-align: center; text-indent: 0pt">93721</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; text-indent: 0pt">(Address of Principal Executive Office)</TD>
    <TD STYLE="text-align: center; text-indent: 0pt">(Zip Code)</TD></TR>
</TABLE>
<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">559-248-4943</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">(Registrant's Telephone Number,
Including Area Code)</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">Check the appropriate box below
if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following
provisions:</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 0pt; margin: 0; font-size: 10pt"><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#160;&#160;Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</FONT></P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 0pt; margin: 0; font-size: 10pt"><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#160;&#160;Soliciting
material pursuant to Rule 14a12 under the Exchange Act (17 CFR 240.14a-12)</FONT></P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 0pt; margin: 0; font-size: 10pt"><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#160;&#160;Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</FONT></P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 0pt; margin: 0; font-size: 10pt"><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#160;&#160;Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</FONT></P>

<P STYLE="margin: 0pt">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ITEM 2.02 RESULTS OF OPERATIONS AND FINANCIAL CONDITION</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">On April 20, 2012, United Security Bancshares issued a press
release reporting its financial results for the quarter ended March 31, 2012. A copy of such press release is attached, and incorporated
herein by reference as Exhibit 99.1</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(d)&#9;Exhibits.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">&#160;</P>

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<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="width: 76px; text-align: left">EXHIBIT&#160;#</TD>
    <TD STYLE="text-align: left; width: 783px">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: left; text-indent: 0pt">99.1&#160;</TD>
    <TD STYLE="text-align: left">
        <P STYLE="margin: 0pt 0">Press release of United Security Bancshares dated April 20, 2012</P></TD></TR>
</TABLE>
<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 0pt; margin: 0"><BR>
</P>

<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">SIGNATURES</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<P STYLE="text-align: left; text-indent: 36pt; margin: 0; font: 10pt Times New Roman, Times, Serif">Pursuant to the requirements
of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned
hereunto duly authorized.</P>

<P STYLE="margin: 0pt">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">United Security Bancshares</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 35%">&nbsp;</TD>
    <TD STYLE="width: 12%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: left; border-bottom-color: #ffffff; border-bottom-style: solid; text-indent: 0pt">Date: April 20, 2012&#160;</TD>
    <TD STYLE="border-bottom-color: #ffffff; border-bottom-style: solid; text-align: left; text-indent: 0pt">By:</TD>
    <TD NOWRAP STYLE="text-align: left; border-bottom: Black 1pt solid">/s/&#160;Richard Shupe</TD>
    <TD STYLE="border-bottom-color: #ffffff; border-bottom-style: solid">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD NOWRAP STYLE="text-align: left; vertical-align: bottom">Senior Vice President &amp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Chief Financial Officer</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="margin: 0pt">&nbsp;</P>

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<P STYLE="text-align: center; text-indent: 0pt; margin: 0; font: 10pt Times New Roman, Times, Serif">EXHIBIT INDEX</P>

<P STYLE="margin: 0pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="background-color: white; width: 100%; font: 10pt Times New Roman, Times, Serif; font-size: 10pt">
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    <TD STYLE="width: 13%; border-bottom: Black 1pt solid">EXHIBIT #</TD>
    <TD STYLE="width: 2%; padding-bottom: 2px">&nbsp;</TD>
    <TD STYLE="width: 85%; border-bottom: Black 1pt solid">DESCRIPTION</TD></TR>
<TR>
    <TD>99.1&#160;&#160;&#160;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: left; text-indent: 0pt">Press release of United Security Bancshares dated April 20, 2012</TD></TR>
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SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT PURSUANT
TO SECTION 13 OR 15(d) OF
THE
SECURITIES EXCHANGE ACT OF
1934
April 20, 2012
Date of Report (Date of earliest
event reported)
UNITED SECURITY BANCSHARES
(Exact Name of Registrant
as Specified in its Charter)
California
(State or Other Jurisdiction
of Incorporation)
000-32987
91-2112732
(Commission
(IRS Employer
File Number)
Identification No.)
2126 Inyo Street, Fresno, CA
93721
(Address of Principal Executive Office)
(Zip Code)
559-248-4943
(Registrant's Telephone Number,
Including Area Code)
Check the appropriate box below
if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following
provisions:
o
Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting
material pursuant to Rule 14a12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
ITEM 2.02 RESULTS OF OPERATIONS AND FINANCIAL CONDITION
On April 20, 2012, United Security Bancshares issued a press
release reporting its financial results for the quarter ended March 31, 2012. A copy of such press release is attached, and incorporated
herein by reference as Exhibit 99.1
ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS.
(d)	Exhibits.
EXHIBIT #
99.1
Press release of United Security Bancshares dated April 20, 2012
SIGNATURES
Pursuant to the requirements
of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned
hereunto duly authorized.
United Security Bancshares
Date: April 20, 2012
By:
/s/ Richard Shupe
Senior Vice President &
Chief Financial Officer
2
EXHIBIT INDEX
EXHIBIT #
DESCRIPTION
99.1
Press release of United Security Bancshares dated April 20, 2012
3