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County · code 06023

Humboldt CountyCalifornia

Humboldt County is a county in California, with its seat in Eureka, formed in 1853. The county was created from Trinity County and named after Alexander von Humboldt.

  • Founded1853
  • County seatEureka
  • Named forAlexander von Humboldt
  • Land area3,568 sq mi + 484 sq mi water
  • Population136,463 2020 Census
  • Parcels mapped72,669 checked 14 October 2026
Open the free map Click any parcel in Humboldt County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

TrinityDel NorteMendocinoSiskiyou Eureka Census outline · seat marked

Where it is

Humboldt on the map of California

California has 58 counties and county equivalents, each with its own records office. Shapes with a page are links.

Alameda CountyAlpine CountyAmador CountyButte CountyCalaveras CountyColusa CountyContra Costa CountyDel Norte CountyEl Dorado CountyFresno CountyGlenn CountyImperial CountyInyo CountyKern CountyKings CountyLake CountyLassen CountyLos Angeles CountyMadera CountyMarin CountyMariposa CountyMendocino CountyMerced CountyModoc CountyMono CountyMonterey CountyNapa CountyNevada CountyOrange CountyPlacer CountyPlumas CountyRiverside CountySacramento CountySan Benito CountySan Bernardino CountySan Diego CountySan Francisco CountySan Joaquin CountySan Luis Obispo CountySan Mateo CountySanta Barbara CountySanta Clara CountySanta Cruz CountyShasta CountySierra CountySiskiyou CountySolano CountySonoma CountyStanislaus CountySutter CountyTehama CountyTrinity CountyTulare CountyTuolumne CountyVentura CountyYolo CountyYuba CountyHumboldt County Humboldt
Counties of California · Humboldt highlighted

History

Formed in 1853 from Trinity County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Humboldt County was created from Trinity County on May 12, 1853. The county lost territory to Mendocino County in 1859, then gained some back in 1860. In 1874, Humboldt County gained the former territory of Klamath County after it was eliminated. In 1901, Humboldt County exchanged small areas with Del Norte County and lost a small area to Siskiyou County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1853
    Humboldt County created Humboldt created from Trinity.
    from Trinity
    · Calif. Stats. 1853, 4th sess., ch. 114/pp. 161-164
  2. 1859
    Lost territory Humboldt lost to Mendocino.
    to Mendocino
    · Calif. Stats. 1859, 10th sess., ch. 108/pp. 98-99
  3. 1860
    Gained territory Humboldt gained from Mendocino.
    from Mendocino
    · Calif. Stats. 1860, 11th sess., ch. 340/p. 334
  4. 1862
    Boundary clarified Humboldt boundaries redefined (no change).
    no change
    · Calif Laws 1862, 13th sess., ch. 11/p. 6
  5. 1874
    Gained territory Humboldt gained part of Klamath; Klamath eliminated. Act passed 28 March 1874; referendum for annexation of Klamath held 30 May 1874.
    from Klamath
    · Calif. Stats. 1873, 20th sess., ch. 520/pp. 755-758; Kasch, 270-272
  6. 1901
    Exchanged territory Humboldt exchanged with Del Norte, lost small area to Siskiyou.
    with Del Nortewith Siskiyou
    · Calif. Stats. 1901, 34th sess., ch. 193/p. 600

Land and parcels

What the maps cover in Humboldt

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Humboldt by the Census

Population
136,463 2020 Census count
Housing units
62,120 2020 Census count
Land area
3,568 square miles
Water area
484 square miles
People per sq mi
38 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open Humboldt County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Humboldt County

When was Humboldt County founded?
Humboldt County was founded in 1853, formed from Trinity County, and named after Alexander von Humboldt.
What is the county seat of Humboldt County?
The county seat of Humboldt County is Eureka.
Is there an online parcel map for Humboldt County?
Yes. Humboldt County publishes a parcel map of 72,669 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Humboldt County's boundary or name changed?
Humboldt County was created in 1853 from Trinity County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Mendocino County, Del Norte County and Klamath County.
Who issues building permits in Humboldt County?
The county's page on building permits: Permitting. Inside a city or town, ask that city first.
Who issues septic and well permits in Humboldt County?
The county's page on septic systems and wells: Health department: septic and well.
Is my lot in a flood zone?
We do not have flood maps for Humboldt County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door