County Maps US

San Joaquin County, California

A county in California, ranked 14 of 58 by population.

CountyFIPS 06077

Within California
San Joaquin County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Stockton, the county seat, located via the 2025 Census Gazetteer.

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Population
823,815
+43,197 (+5.5%) since 2020
Land area
1,392
square miles. A further 2.4% of the total area is water
Population density
592
people per square mile, computed rather than published
County seat
Stockton
Seat of county government.
Established
1850
175 years ago
Largest city
Stockton city
Population 324,597.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of San Joaquin County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of San Joaquin County, California from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 543 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where San Joaquin County ranks

Position among the 58 counties of California, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn CaliforniaNationally
Population823,81514th of 5880th of 3,144
Land area1,392 sq mi33rd of 58434th of 3,144
Population density592 per sq mi10th of 58244th of 3,144
Median household income$92,17923rd of 58264th of 3,143

Full data for San Joaquin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population823,815Vintage 2025 Population Estimates
Population in 2020780,618Vintage 2025 Population Estimates
2020 estimates base?779,234Vintage 2025 Population Estimates
Land area1,392 sq mi2025 Gazetteer Files
Water area34.3 sq mi2025 Gazetteer Files
Total area1,427 sq mi2025 Gazetteer Files
Population density?592 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$92,179American Community Survey 2020-2024 5-Year Estimates
Median home value$530,700American Community Survey 2020-2024 5-Year Estimates
Median age35.4American Community Survey 2020-2024 5-Year Estimates
Households245,250American Community Survey 2020-2024 5-Year Estimates
Housing units260,151American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+3,401
9,506 births, 6,105 deaths
Net migration
+3,176
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering San Joaquin County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Stanislaus CountyCalifornia79 mi557,719
Sacramento CountyCalifornia48 mi1,618,460
Contra Costa CountyCalifornia35 mi1,170,070
Alameda CountyCalifornia27 mi1,636,630
Calaveras CountyCalifornia11 mi46,605
Amador CountyCalifornia5.5 mi41,876

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

Side by side

All 58 counties of California

Open the interactive California county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.