County Maps US

Tuolumne County, California

A county in California, ranked 43 of 58 by population.

CountyFIPS 06109

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

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Population
53,160
-2,209 (-4.0%) since 2020
Land area
2,221
square miles. A further 2.4% of the total area is water
Population density
23.9
people per square mile, computed rather than published
County seat
Sonora
Seat of county government.
Established
1850
175 years ago
Largest city
Sonora city
Population 4,866.

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 Tuolumne 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 Tuolumne 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 800 by 584 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 Tuolumne 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
Population53,16043rd of 58975th of 3,144
Land area2,221 sq mi23rd of 58254th of 3,144
Population density23.9 per sq mi45th of 582,097th of 3,144
Median household income$77,40433rd of 58703rd of 3,143

Full data for Tuolumne County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population53,160Vintage 2025 Population Estimates
Population in 202055,369Vintage 2025 Population Estimates
2020 estimates base?55,612Vintage 2025 Population Estimates
Land area2,221 sq mi2025 Gazetteer Files
Water area53.5 sq mi2025 Gazetteer Files
Total area2,274 sq mi2025 Gazetteer Files
Population density?23.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$77,404American Community Survey 2020-2024 5-Year Estimates
Median home value$433,200American Community Survey 2020-2024 5-Year Estimates
Median age48.4American Community Survey 2020-2024 5-Year Estimates
Households22,690American Community Survey 2020-2024 5-Year Estimates
Housing units31,589American 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
-253
439 births, 692 deaths
Net migration
-766
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 6 areas bordering Tuolumne 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
Mariposa CountyCalifornia108 mi16,918
Mono CountyCalifornia77 mi12,505
Calaveras CountyCalifornia70 mi46,605
Alpine CountyCalifornia28 mi1,043
Stanislaus CountyCalifornia20 mi557,719
Madera CountyCalifornia4.1 mi167,927

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

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.