Glenn County, California
County seat: Willows · Population 28,141 (2025) · 1,314 sq mi
Glenn County is the 47th most populous of California's 58 counties, with 28,141 people (2025 estimate). Its county seat is Willows. The map shows its 2 cities and towns and the 5 neighboring counties.
Glenn County facts
- County seat
- Willows
- Population (2025 estimate)
- 28,141 −2.7% since 2020
- Land area
- 1,314 sq mi 36th largest of 58
- Water area
- 13 sq mi
- Population density
- 21 per sq mi
- Established
- 1891
- Named after
- Hugh J. Glenn American politician and businessman (1824-1883)
- Largest city
- Orland 8,381
- Median household income
- $67,139
- Cities and towns
- 2 plus 3 CDPs
- ZIP codes
- 8
- Time zone
- Pacific
- FIPS code
- 06021
Cities and towns in Glenn County
Glenn County has 2 incorporated cities, towns and villages. Populations count the people living inside Glenn County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Orland | City | 8,381 | |
| Willows (county seat) | City | 6,116 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Hamilton City | 2,267 | |
| Artois | 336 | |
| Elk Creek | 36 |
ZIP codes in Glenn County
8 ZIP codes reach into Glenn County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 95913
- 95920
- 95939
- 95943
- 95951
- 95963 also Tehama County
- 95970 also Colusa County
- 95988
Population of Glenn County, 2020–2025
Glenn County shrank by 769 people (−2.7%) between April 2020 and July 2025: 159 more births than deaths and a net loss of 936 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 28,889 |
| 2021 | 28,689 |
| 2022 | 28,363 |
| 2023 | 28,168 |
| 2024 | 28,320 |
| 2025 | 28,141 |
Neighboring counties
- Butte County east · 209,211 people
- Colusa County south · 21,836 people
- Tehama County north · 64,665 people
- Lake County southwest · 67,772 people
- Mendocino County west · 88,122 people
Printable Glenn 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) (96 KB)
- PNG (2400 px) (67 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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