County Maps US

Humboldt County, California

A county in California, ranked 35 of 58 by population.

CountyFIPS 06023

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

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Population
131,647
-4,651 (-3.4%) since 2020
Land area
3,568
square miles. A further 11.9% of the total area is water
Population density
36.9
people per square mile, computed rather than published
County seat
Eureka
Seat of county government.
Established
1853
172 years ago
Largest city
Eureka city
Population 25,304.

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 Humboldt 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 Humboldt 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 457 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 Humboldt 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
Population131,64735th of 58503rd of 3,144
Land area3,568 sq mi14th of 58142nd of 3,144
Population density36.9 per sq mi42nd of 581,750th of 3,144
Median household income$61,16053rd of 581,970th of 3,143

Full data for Humboldt County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population131,647Vintage 2025 Population Estimates
Population in 2020136,298Vintage 2025 Population Estimates
2020 estimates base?136,462Vintage 2025 Population Estimates
Land area3,568 sq mi2025 Gazetteer Files
Water area484.2 sq mi2025 Gazetteer Files
Total area4,052 sq mi2025 Gazetteer Files
Population density?36.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,160American Community Survey 2020-2024 5-Year Estimates
Median home value$446,900American Community Survey 2020-2024 5-Year Estimates
Median age39.9American Community Survey 2020-2024 5-Year Estimates
Households54,922American Community Survey 2020-2024 5-Year Estimates
Housing units62,883American 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
-421
1,028 births, 1,449 deaths
Net migration
-261
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 Humboldt 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
Trinity CountyCalifornia109 mi15,720
Mendocino CountyCalifornia31 mi88,122
Del Norte CountyCalifornia31 mi26,410
Siskiyou CountyCalifornia26 mi42,013

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.