Siskiyou County, California
County seat: Yreka · Population 42,013 (2025) · 6,279 sq mi
Siskiyou County is the 45th most populous of California's 58 counties, with 42,013 people (2025 estimate). Its county seat is Yreka. The map shows its 9 cities and towns and the 8 neighboring counties.
Siskiyou County facts
- County seat
- Yreka
- Population (2025 estimate)
- 42,013 −4.7% since 2020
- Land area
- 6,279 sq mi 5th largest of 58
- Water area
- 69 sq mi
- Population density
- 7 per sq mi
- Established
- 1852
- Named after
- Siskiyou Trail old Native American and pioneer trail connecting Oregon and California
- Largest city
- Yreka 7,714
- Median household income
- $59,095
- Cities and towns
- 9 plus 12 CDPs
- ZIP codes
- 23
- Time zone
- Pacific
- FIPS code
- 06093
Cities and towns in Siskiyou County
Siskiyou County has 9 incorporated cities, towns and villages. Populations count the people living inside Siskiyou County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Yreka (county seat) | City | 7,714 | |
| Mount Shasta | City | 3,071 | |
| Weed | City | 2,603 | |
| Dunsmuir | City | 1,587 | |
| Montague | City | 1,157 | |
| Tulelake | City | 833 | |
| Dorris | City | 803 | |
| Fort Jones | City | 659 | |
| Etna | City | 631 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lake Shastina | 3,001 | |
| McCloud | 829 | |
| Happy Camp | 539 | |
| Hornbrook | 268 | |
| Grenada | 254 | |
| Macdoel | 184 | |
| Gazelle | 87 | |
| Greenview | 73 | |
| Mount Hebron | 73 | |
| Tennant | 71 | |
| Carrick | 10 | |
| Edgewood | 0 |
ZIP codes in Siskiyou County
23 ZIP codes reach into Siskiyou County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 95556 also Humboldt County
- 95568
- 96014
- 96023
- 96025 also Shasta County
- 96027
- 96031
- 96032
- 96034
- 96037
- 96038
- 96039
- 96044
- 96050
- 96057
- 96058
- 96064
- 96067
- 96085
- 96086
- 96094
- 96097
- 96134 also Modoc County
Population of Siskiyou County, 2020–2025
Siskiyou County shrank by 2,063 people (−4.7%) between April 2020 and July 2025: 1,408 more deaths than births and a net loss of 646 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 43,983 |
| 2021 | 44,058 |
| 2022 | 43,602 |
| 2023 | 42,856 |
| 2024 | 42,490 |
| 2025 | 42,013 |
Neighboring counties
- Trinity County southwest · 15,720 people
- Del Norte County west · 26,410 people
- Modoc County east · 8,426 people
- Shasta County southeast · 181,648 people
- Jackson County, Oregon north · 221,795 people
- Klamath County, Oregon northeast · 70,274 people
- Humboldt County southwest · 131,647 people
- Josephine County, Oregon northwest · 87,867 people
Printable Siskiyou 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.
- PDF (Letter) (149 KB)
- PNG (2400 px) (90 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
Back to the California county map with all 58 counties. Found an error? Tell us.