Humboldt County, California

County seat: Eureka · Population 131,647 (2025) · 3,568 sq mi

Humboldt County is the 35th most populous of California's 58 counties, with 131,647 people (2025 estimate). Its county seat is Eureka. The map shows its 7 cities and towns and the 4 neighboring counties.

Map of Humboldt County, California with cities, towns and the county boundary
Humboldt County, California with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
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Humboldt County facts

County seat
Eureka
Population (2025 estimate)
131,647 −3.5% since 2020
Land area
3,568 sq mi 14th largest of 58
Water area
484 sq mi
Population density
37 per sq mi
Established
1853
Named after
Alexander von Humboldt Prussian geographer, naturalist and explorer (1769–1859)
Largest city
Eureka 25,304
Median household income
$61,160
Cities and towns
7 plus 33 CDPs
ZIP codes
36
Time zone
Pacific
FIPS code
06023

Cities and towns in Humboldt County

Humboldt County has 7 incorporated cities, towns and villages. Populations count the people living inside Humboldt County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Eureka (county seat)City25,304
ArcataCity19,047
FortunaCity12,003
Rio DellCity3,211
FerndaleCity1,348
Blue LakeCity1,144
TrinidadCity317

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
McKinleyville17,113
Myrtletown5,322
Humboldt Hill3,551
Cutten3,550
Pine Hills2,875
Bayview2,803
Hoopa2,233
Westhaven-Moonstone1,537
Garberville1,415
Hydesville1,263
Redway1,145
Willow Creek1,076
Manila985
Fieldbrook736
Loleta723
Indianola560
Shelter Cove543
Fields Landing532
Miranda513
Scotia405
Benbow316
Fairhaven293
Orick199
Samoa151
Big Lagoon138
Weitchpec104
Weott81
Alderpoint71
Myers Flat69
Redcrest12
Kep'el10
Wautec6
Phillipsville0

ZIP codes in Humboldt County

36 ZIP codes reach into Humboldt County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Humboldt County, 2020–2025

Humboldt County shrank by 4,815 people (−3.5%) between April 2020 and July 2025: 1,983 more deaths than births and a net loss of 2,819 people from migration.

Year (July 1)Population
2020136,298
2021135,070
2022134,979
2023133,956
2024132,324
2025131,647

Neighboring counties

Printable Humboldt County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

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Sources

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