County Maps US

Stanislaus County, California

A county in California, ranked 16 of 58 by population.

CountyFIPS 06099

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

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Population
557,719
+4,017 (+0.7%) since 2020
Land area
1,496
square miles. A further 1.2% of the total area is water
Population density
373
people per square mile, computed rather than published
County seat
Modesto
Seat of county government.
Established
1854
171 years ago
Largest city
Modesto city
Population 219,652.

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 Stanislaus 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 Stanislaus 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 746 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 Stanislaus 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
Population557,71916th of 58130th of 3,144
Land area1,496 sq mi30th of 58402nd of 3,144
Population density373 per sq mi15th of 58369th of 3,144
Median household income$81,46830th of 58525th of 3,143

Full data for Stanislaus County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population557,719Vintage 2025 Population Estimates
Population in 2020553,702Vintage 2025 Population Estimates
2020 estimates base?553,284Vintage 2025 Population Estimates
Land area1,496 sq mi2025 Gazetteer Files
Water area17.9 sq mi2025 Gazetteer Files
Total area1,514 sq mi2025 Gazetteer Files
Population density?373 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$81,468American Community Survey 2020-2024 5-Year Estimates
Median home value$450,100American Community Survey 2020-2024 5-Year Estimates
Median age34.9American Community Survey 2020-2024 5-Year Estimates
Households177,874American Community Survey 2020-2024 5-Year Estimates
Housing units185,149American 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
+2,007
6,693 births, 4,686 deaths
Net migration
-1,701
More people moved out than moved in.

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

The 7 areas bordering Stanislaus 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
San Joaquin CountyCalifornia79 mi823,815
Merced CountyCalifornia64 mi297,260
Santa Clara CountyCalifornia49 mi1,914,391
Calaveras CountyCalifornia23 mi46,605
Tuolumne CountyCalifornia20 mi53,160
Alameda CountyCalifornia253 ft1,636,630
Mariposa CountyCalifornia220 ft16,918

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.