County Maps US

Napa County, California

A county in California, ranked 34 of 58 by population.

CountyFIPS 06055

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

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Population
132,949
-4,532 (-3.3%) since 2020
Land area
752
square miles. A further 5.1% of the total area is water
Population density
177
people per square mile, computed rather than published
County seat
Napa
Seat of county government.
Established
1850
175 years ago
Largest city
Napa city
Population 76,562.

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 Napa 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 Napa 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 547 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 Napa 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
Population132,94934th of 58499th of 3,144
Land area752 sq mi48th of 581,172nd of 3,144
Population density177 per sq mi20th of 58609th of 3,144
Median household income$111,47110th of 5887th of 3,143

Full data for Napa County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population132,949Vintage 2025 Population Estimates
Population in 2020137,481Vintage 2025 Population Estimates
2020 estimates base?138,023Vintage 2025 Population Estimates
Land area752 sq mi2025 Gazetteer Files
Water area40.3 sq mi2025 Gazetteer Files
Total area792.3 sq mi2025 Gazetteer Files
Population density?177 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$111,471American Community Survey 2020-2024 5-Year Estimates
Median home value$869,500American Community Survey 2020-2024 5-Year Estimates
Median age42.9American Community Survey 2020-2024 5-Year Estimates
Households49,763American Community Survey 2020-2024 5-Year Estimates
Housing units55,817American 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
-7
1,242 births, 1,249 deaths
Net migration
-167
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 4 areas bordering Napa 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
Sonoma CountyCalifornia61 mi486,444
Solano CountyCalifornia54 mi455,376
Yolo CountyCalifornia39 mi224,410
Lake CountyCalifornia25 mi67,772

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.