County Maps US

San Francisco County, California

A county in California, ranked 13 of 58 by population.

CountyFIPS 06075

Within California
San Francisco County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data.

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Population
826,079
-49,060 (-5.6%) since 2020
Land area
46.7
square miles. A further 79.9% of the total area is water
Population density
17,695
people per square mile, computed rather than published
County seat
San Francisco
Seat of county government.
Established
1850
175 years ago
Largest city
San Francisco city
Population 826,079.

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 Francisco 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 Francisco 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 310 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 Francisco 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
Population826,07913th of 5879th of 3,144
Land area46.7 sq mi58th of 583,106th of 3,144
Population density17,695 per sq mi1st of 585th of 3,144
Median household income$140,9704th of 5814th of 3,143

Full data for San Francisco County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population826,079Vintage 2025 Population Estimates
Population in 2020875,139Vintage 2025 Population Estimates
2020 estimates base?878,550Vintage 2025 Population Estimates
Land area46.7 sq mi2025 Gazetteer Files
Water area185.2 sq mi2025 Gazetteer Files
Total area231.9 sq mi2025 Gazetteer Files
Population density?17,695 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$140,970American Community Survey 2020-2024 5-Year Estimates
Median home value$1,394,500American Community Survey 2020-2024 5-Year Estimates
Median age40.0American Community Survey 2020-2024 5-Year Estimates
Households363,970American Community Survey 2020-2024 5-Year Estimates
Housing units414,602American 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
+574
6,845 births, 6,271 deaths
Net migration
+4,530
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 4 areas bordering San Francisco 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
Marin CountyCalifornia19 mi253,694
San Mateo CountyCalifornia17 mi743,568
Alameda CountyCalifornia13 mi1,636,630
Contra Costa CountyCalifornia4.5 mi1,170,070

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.