Trinity County, California
County seat: Weaverville · Population 15,720 (2025) · 3,179 sq mi
Trinity County is the 54th most populous of California's 58 counties, with 15,720 people (2025 estimate). Its county seat is Weaverville. The map shows its 0 cities and towns and the 5 neighboring counties.
Trinity County facts
- County seat
- Weaverville
- Population (2025 estimate)
- 15,720 −2.5% since 2020
- Land area
- 3,179 sq mi 18th largest of 58
- Water area
- 28 sq mi
- Population density
- 5 per sq mi
- Established
- 1850
- Named after
- Trinity River river in northern California, United States
- Largest city
- Weaverville 4,018
- Median household income
- $53,002
- Cities and towns
- 0 plus 14 CDPs
- ZIP codes
- 14
- Time zone
- Pacific
- FIPS code
- 06105
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Weaverville | 4,018 | |
| Hayfork | 2,537 | |
| Lewiston | 2,020 | |
| Junction City | 1,190 | |
| Douglas City | 1,060 | |
| Salyer | 487 | |
| Ruth | 480 | |
| Trinity Center | 414 | |
| Burnt Ranch | 318 | |
| Coffee Creek | 280 | |
| Mad River | 272 | |
| Post Mountain | 233 | |
| Trinity Village | 209 | |
| Hyampom | 102 |
ZIP codes in Trinity County
14 ZIP codes reach into Trinity County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 95526 also Humboldt County
- 95527
- 95552 also Humboldt County
- 95563
- 95595
- 96010
- 96024
- 96041
- 96046
- 96048
- 96052
- 96076 also Tehama and Shasta counties
- 96091
- 96093
Population of Trinity County, 2020–2025
Trinity County shrank by 396 people (−2.5%) between April 2020 and July 2025: 392 more deaths than births and a net gain of 12 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 16,099 |
| 2021 | 16,110 |
| 2022 | 15,813 |
| 2023 | 15,690 |
| 2024 | 15,697 |
| 2025 | 15,720 |
Neighboring counties
- Humboldt County west · 131,647 people
- Siskiyou County northeast · 42,013 people
- Shasta County east · 181,648 people
- Mendocino County south · 88,122 people
- Tehama County southeast · 64,665 people
Printable Trinity 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) (156 KB)
- PNG (2400 px) (112 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.
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