San Joaquin County, California

County seat: Stockton · Population 823,815 (2025) · 1,392 sq mi

San Joaquin County is the 14th most populous of California's 58 counties, with 823,815 people (2025 estimate). Its county seat is Stockton. The map shows its 8 cities and towns and the 6 neighboring counties.

Map of San Joaquin County, California with cities, towns and the county boundary
San Joaquin County, California with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
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San Joaquin County facts

County seat
Stockton
Population (2025 estimate)
823,815 +5.7% since 2020
Land area
1,392 sq mi 33rd largest of 58
Water area
34 sq mi
Population density
592 per sq mi
Established
1850
Named after
San Joaquin River river in California, United States
Largest city
Stockton 324,597
Median household income
$92,179
Cities and towns
8 plus 20 CDPs
ZIP codes
37
Time zone
Pacific
FIPS code
06077

Cities and towns in San Joaquin County

San Joaquin County has 8 incorporated cities, towns and villages. Populations count the people living inside San Joaquin County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Stockton (county seat)City324,597
TracyCity101,901
MantecaCity96,693
LodiCity69,100
LathropCity42,783
Mountain HouseCity25,315
RiponCity16,140
EscalonCity7,394

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Garden Acres10,667
Country Club10,161
August8,825
Lincoln Village4,241
Woodbridge4,144
Lockeford3,838
Morada3,383
French Camp3,264
Dogtown3,094
Kennedy2,576
Collierville2,546
Linden2,389
Taft Mosswood1,343
Waterloo894
Thornton817
Peters568
Victor460
Terminous365
Acampo234
Farmington49

ZIP codes in San Joaquin County

37 ZIP codes reach into San Joaquin County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of San Joaquin County, 2020–2025

San Joaquin County grew by 44,581 people (+5.7%) between April 2020 and July 2025: 16,691 more births than deaths and a net gain of 27,893 people from migration.

Year (July 1)Population
2020780,618
2021788,040
2022795,443
2023806,055
2024817,149
2025823,815

Neighboring counties

Printable San Joaquin County map

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Sources

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