County Maps US

Plumas County, California

A county in California, ranked 51 of 58 by population.

CountyFIPS 06063

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

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Population
18,583
-1,162 (-5.9%) since 2020
Land area
2,553
square miles. A further 2.3% of the total area is water
Population density
7.3
people per square mile, computed rather than published
County seat
Quincy
Seat of county government.
Established
1854
171 years ago
Largest city
Portola city
Population 2,024.

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 Plumas 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 Plumas 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 654 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 Plumas 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
Population18,58351st of 581,906th of 3,144
Land area2,553 sq mi22nd of 58215th of 3,144
Population density7.3 per sq mi50th of 582,672nd of 3,144
Median household income$66,03149th of 581,536th of 3,143

Full data for Plumas County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population18,583Vintage 2025 Population Estimates
Population in 202019,745Vintage 2025 Population Estimates
2020 estimates base?19,794Vintage 2025 Population Estimates
Land area2,553 sq mi2025 Gazetteer Files
Water area60.4 sq mi2025 Gazetteer Files
Total area2,613 sq mi2025 Gazetteer Files
Population density?7.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$66,031American Community Survey 2020-2024 5-Year Estimates
Median home value$360,200American Community Survey 2020-2024 5-Year Estimates
Median age52.0American Community Survey 2020-2024 5-Year Estimates
Households8,054American Community Survey 2020-2024 5-Year Estimates
Housing units14,921American 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
-133
119 births, 252 deaths
Net migration
-59
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 Plumas 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
Lassen CountyCalifornia136 mi28,117
Butte CountyCalifornia66 mi209,211
Sierra CountyCalifornia62 mi3,098
Tehama CountyCalifornia36 mi64,665
Shasta CountyCalifornia9.1 mi181,648
Yuba CountyCalifornia4.6 mi88,691

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.