Adams County, Washington
County seat: Ritzville · Population 21,488 (2025) · 1,925 sq mi
Adams County is the 31st most populous of Washington's 39 counties, with 21,488 people (2025 estimate). Its county seat is Ritzville. The map shows its 5 cities and towns and the 4 neighboring counties.
Adams County facts
- County seat
- Ritzville
- Population (2025 estimate)
- 21,488 +4.3% since 2020
- Land area
- 1,925 sq mi 14th largest of 39
- Water area
- 5 sq mi
- Population density
- 11 per sq mi
- Established
- 1883
- Same name
- One of 12 Adams Counties in the US
- Named after
- John Adams Founding Father, U.S. president from 1797 to 1801 (1735–1826)
- Largest city
- Othello 9,237
- Median household income
- $66,136
- Cities and towns
- 5
- ZIP codes
- 11
- Time zone
- Pacific
- FIPS code
- 53001
Cities and towns in Adams County
Adams County has 5 incorporated cities, towns and villages. Populations count the people living inside Adams County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Othello | City | 9,237 | |
| Ritzville (county seat) | City | 1,709 | |
| Lind | Town | 522 | |
| Washtucna | Town | 199 | |
| Hatton | Town | 170 |
ZIP codes in Adams County
11 ZIP codes reach into Adams County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 98832 also Grant and Lincoln counties
- 98857 also Grant County
- 99032 also Lincoln and Spokane counties
- 99105
- 99159 also Lincoln County
- 99169 also Lincoln County
- 99326 also Franklin County
- 99333 also Whitman County
- 99341
- 99344 also Grant and Franklin counties
- 99371 also Franklin County
Population of Adams County, 2020–2025
Adams County grew by 878 people (+4.3%) between April 2020 and July 2025: 1,181 more births than deaths and a net loss of 288 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 20,610 |
| 2021 | 20,644 |
| 2022 | 20,849 |
| 2023 | 20,903 |
| 2024 | 21,322 |
| 2025 | 21,488 |
Neighboring counties
- Franklin County southwest · 102,612 people
- Grant County west · 105,727 people
- Whitman County east · 48,512 people
- Lincoln County north · 11,982 people
Printable Adams 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) (61 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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