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County · code 06093

Siskiyou CountyCalifornia

Siskiyou County is a county in California with its seat in Yreka. It was formed on March 22, 1852, from parts of Klamath and Shasta counties.

  • Founded1852
  • County seatYreka
  • Named forSiskiyou Trail
  • Land area6,279 sq mi + 69 sq mi water
  • Population44,076 2020 Census
  • Parcels mapped53,720 checked 15 October 2026
Open the free map Click any parcel in Siskiyou County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Jackson, ORShastaTrinityJosephine, ORKlamath, ORDel NorteHumboldtModoc Yreka Census outline · seat marked

Where it is

Siskiyou 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 CountyHumboldt 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 CountySolano CountySonoma CountyStanislaus CountySutter CountyTehama CountyTrinity CountyTulare CountyTuolumne CountyVentura CountyYolo CountyYuba CountySiskiyou County Siskiyou
Counties of California · Siskiyou highlighted

History

Formed in 1852 from Klamath County and Shasta County

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

Siskiyou County was created on March 22, 1852, from Klamath (extinct) and Shasta. The county was named after the Siskiyou Trail. Over the following decades, Siskiyou's boundaries shifted as it lost land to the creation of Del Norte (1857) and Modoc (1874), exchanged areas with Del Norte (1873, 1887), and gained part of Klamath when that county was eliminated (1874).

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

  1. 1852
    Siskiyou County created Siskiyou created from Klamath (extinct) and Shasta.
    from Klamathfrom Shasta
    · Calif. Stats. 1852, 3d sess., ch. 146/pp. 233-235
  2. 1857
    Lost territory Siskiyou lost small area to creation of Del Norte.
    to Del Norte
    · Calif. Stats. 1857, 8th sess., ch. 52/pp. 35-36
  3. 1873
    Exchanged territory Siskiyou exchanged with Del Norte.
    with Del Norte
    · Political Code 1872, 1:secs. 3909, 3913/pp. 113-114, 117
  4. 1874
    Lost territory Siskiyou lost to creation of Modoc.
    to Modoc
    · Calif. Stats. 1873, 20th sess., ch. 107/pp. 124-129
  5. 1874
    Gained territory Siskiyou 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. 1887
    Exchanged territory Siskiyou exchanged with Del Norte.
    with Del Norte
    · Calif. Stats. 1887, 27th sess., ch. 88/pp. 105-107
  7. 1901
    Gained territory Siskiyou gained small area from Humboldt.
    from Humboldt
    · Calif. Stats. 1901, 34th sess., ch. 193/p. 600

Land and parcels

What the maps cover in Siskiyou

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

Siskiyou by the Census

Population
44,076 2020 Census count
Housing units
22,929 2020 Census count
Land area
6,279 square miles
Water area
69 square miles
People per sq mi
7 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.

Permits

Zoning and code

GIS and maps

County government

See your own lot on these maps

Open Siskiyou 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 Siskiyou County

When was Siskiyou County founded?
Siskiyou County was founded in 1852, formed from Klamath County and Shasta County, and named after Siskiyou Trail.
What is the county seat of Siskiyou County?
The county seat of Siskiyou County is Yreka.
Is there an online parcel map for Siskiyou County?
Yes. Siskiyou County publishes a parcel map of 53,720 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Siskiyou County's boundary or name changed?
Siskiyou County was created in 1852 from Klamath County and Shasta County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Del Norte County, Humboldt County and Klamath County.
Who issues building permits in Siskiyou County?
The county's page on building permits: Forms, Permits, and Applications. Inside a city or town, ask that city first.
Who issues septic and well permits in Siskiyou County?
The county's page on septic systems and wells: SUD Staff.
Is my lot in a flood zone?
We do not have flood maps for Siskiyou 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