<ACCESSION-NUMBER>0001137547-18-000038 <TYPE>10-Q <PUBLIC-DOCUMENT-COUNT>67 <PERIOD>20180930 <FILING-DATE>20181102 <DATE-OF-FILING-DATE-CHANGE>20181102 <FILER> <COMPANY-DATA> <CONFORMED-NAME>UNITED SECURITY BANCSHARES <CIK>0001137547 <ASSIGNED-SIC>6021 <IRS-NUMBER>912112732 <STATE-OF-INCORPORATION>CA <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>10-Q <ACT>34 <FILE-NUMBER>000-32897 <FILM-NUMBER>181156898 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>2126 INYO STREET <CITY>FRESNO <STATE>CA <ZIP>93721 <PHONE>5592484930 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>2126 INYO STREET <CITY>FRESNO <STATE>CA <ZIP>93721 </MAIL-ADDRESS> </FILER>