San Joaquin County, California

San Joaquin County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF SAN JOAQUIN GUS Population: 816,108 (2024) ID: 161112	County	Official County Government	Contact: SENIOR DEPUTY COUNTY ADMINISTRATOR 222 E WEBER AVE, STOCKTON CA 95202-2709
CITY OF STOCKTON GUS Population: 324,975 (2024) ID: 211214	Municipal	Municipal Government Within County	Contact: MAYOR 425 N EL DORADO ST, STOCKTON CA 95202-1997
CITY OF TRACY GUS Population: 100,136 (2024) ID: 225766	Municipal	Municipal Government Within County	Contact: CITY MANAGER 333 CIVIC CENTER PLZ, TRACY CA 95376-4059
CITY OF MANTECA GUS Population: 94,292 (2024) ID: 161259	Municipal	Municipal Government Within County	Contact: FINANCE DIRECTOR 1001 W CENTER ST, MANTECA CA 95337-4390
CITY OF LODI GUS Population: 68,642 (2024) ID: 123153	Municipal	Municipal Government Within County	Contact: CITY CLERK 221 W PINE ST, LODI CA 95240-2089
CITY OF LATHROP GUS Population: 40,860 (2024) ID: 207599	Municipal	Municipal Government Within County	Contact: FINANCE DIRECTOR 390 TOWNE CENTRE DR, LATHROP CA 95330-9358
CITY OF MOUNTAIN HOUSE GUS Population: 25,909 (2024) ID: 251934	Municipal	Municipal Government Within County	Contact: TOWN HALL 251 E MAIN STREET, MOUNTAIN HOUSE CA 95391
CITY OF RIPON GUS Population: 16,252 (2024) ID: 123154	Municipal	Municipal Government Within County	Contact: CITY CLERK FINANCE DIRECTOR 259 N WILMA AVE, RIPON CA 95366-3028
CITY OF ESCALON GUS Population: 7,453 (2024) ID: 100733	Municipal	Municipal Government Within County	Contact: MAYOR 2060 MCHENRY AVE, ESCALON CA 95320-9484