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      <filer>
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          <!-- Field: Pseudo-Tag; ID: Name; Data: OBERG ROBERT C JR -->
          <cik>0001243275</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>


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    <issuerInfo>
      <issuerCik>0001137547</issuerCik>
      <issuerName>UNITED SECURITY BANCSHARES</issuerName>
      <secFileNumber>000-32897</secFileNumber>
      <issuerAddress>
        <com:street1>2126 INYO STREET</com:street1>
        <com:city>FRESNO</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>93721</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>559-248-4864</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Robert Oberg</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer, SVP, Chief Risk Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Apex Clearing</name>
        <address>
          <com:street1>350 St Paul St., Suite 1300</com:street1>
          <com:city>Dallas</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>75201</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>4200</noOfUnitsSold>
      <aggregateMarketValue>33810.00</aggregateMarketValue>
      <noOfUnitsOutstanding>17140000</noOfUnitsOutstanding>
      <approxSaleDate>11/16/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <acquiredDate>12/31/2019</acquiredDate>
      <natureOfAcquisitionTransaction>Sale of vested/owned shares</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>UNITED SECURITY BANCSHARES</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>976</amountOfSecuritiesAcquired>
      <paymentDate>12/31/2019</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <acquiredDate>12/31/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Sale of vested/owned shares</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>UNITED SECURITY BANCSHARES</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1385</amountOfSecuritiesAcquired>
      <paymentDate>12/31/2021</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <acquiredDate>10/23/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Sale of vested/owned shares</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>UNITED SECURITY BANCSHARES</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1839</amountOfSecuritiesAcquired>
      <paymentDate>10/23/2021</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>11/21/2023</noticeDate>
      <signature>/s/ Robert Oberg, Chief Risk Officer</signature>
    </noticeSignature>
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144
0001243275
XXXXXXXX
LIVE
0001137547
UNITED SECURITY BANCSHARES
000-32897
2126 INYO STREET
FRESNO
CA
93721
559-248-4864
Robert Oberg
Officer, SVP, Chief Risk Officer
COMMON
Apex Clearing
350 St Paul St., Suite 1300
Dallas
TX
75201
4200
33810.00
17140000
11/16/2023
NASDAQ
COMMON
12/31/2019
Sale of vested/owned shares
UNITED SECURITY BANCSHARES
N
976
12/31/2019
Cash
COMMON
12/31/2021
Sale of vested/owned shares
UNITED SECURITY BANCSHARES
N
1385
12/31/2021
Cash
COMMON
10/23/2021
Sale of vested/owned shares
UNITED SECURITY BANCSHARES
N
1839
10/23/2021
Cash
Y
11/21/2023
/s/ Robert Oberg, Chief Risk Officer