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  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001559630</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000066004</issuerCik>
      <issuerName>MIDDLESEX WATER CO</issuerName>
      <secFileNumber>000-00422</secFileNumber>
      <issuerAddress>
        <com:street1>485C ROUTE 1 SOUTH</com:street1>
        <com:street2>SUITE 400</com:street2>
        <com:city>ISELIN</com:city>
        <com:stateOrCountry>NJ</com:stateOrCountry>
        <com:zipCode>08830</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>7326341500</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Ginegaw Lorrie Beth</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab Corporation</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>300</noOfUnitsSold>
      <aggregateMarketValue>21183.00</aggregateMarketValue>
      <noOfUnitsOutstanding>17806696</noOfUnitsOutstanding>
      <approxSaleDate>12/20/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>01/01/2018</acquiredDate>
      <natureOfAcquisitionTransaction>RSA</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>500</amountOfSecuritiesAcquired>
      <paymentDate>01/01/2018</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>Shares acquired in various lots throughout 2018 via employee compensation</remarks>
    <noticeSignature>
      <noticeDate>12/20/2023</noticeDate>
      <signature>Lorrie B Ginegaw</signature>
    </noticeSignature>
  </formData>
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144
0001559630
XXXXXXXX
LIVE
0000066004
MIDDLESEX WATER CO
000-00422
485C ROUTE 1 SOUTH
SUITE 400
ISELIN
NJ
08830
7326341500
Ginegaw Lorrie Beth
Officer
Common
Charles Schwab Corporation
3000 Schwab Way
Westlake
TX
76262
300
21183.00
17806696
12/20/2023
NASDAQ
Common
01/01/2018
RSA
Issuer
N
500
01/01/2018
Equity Compensation
Y
Shares acquired in various lots throughout 2018 via employee compensation
12/20/2023
Lorrie B Ginegaw