Wahkiakum County, Washington
County seat: Cathlamet · Population 4,873 (2025) · 263 sq mi
Wahkiakum County is the 37th most populous of Washington's 39 counties, with 4,873 people (2025 estimate). Its county seat is Cathlamet. The map shows its 1 city or town and the 5 neighboring counties.
Wahkiakum County facts
- County seat
- Cathlamet
- Population (2025 estimate)
- 4,873 +10.3% since 2020
- Land area
- 263 sq mi 37th largest of 39
- Water area
- 24 sq mi
- Population density
- 19 per sq mi
- Established
- 1854
- Named after
- Wahkiakum chief of the Chinook
- Largest city
- Puget Island 1,008
- Median household income
- $62,653
- Cities and towns
- 1 plus 9 CDPs
- ZIP codes
- 6
- Time zone
- Pacific
- FIPS code
- 53069
Cities and towns in Wahkiakum County
Wahkiakum County has 1 incorporated place. Populations count the people living inside Wahkiakum County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Cathlamet (county seat) | Town | 610 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Puget Island | 1,008 | |
| East Cathlamet | 934 | |
| Rosburg | 528 | |
| Skamokawa Valley | 352 | |
| Lower Elochoman | 271 | |
| Grays River | 195 | |
| Deep River | 147 | |
| Upper Elochoman | 49 | |
| Altoona | 43 |
ZIP codes in Wahkiakum County
6 ZIP codes reach into Wahkiakum County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 98612
- 98621 also Pacific County
- 98632 also Cowlitz County
- 98638 also Pacific County
- 98643
- 98647
Population of Wahkiakum County, 2020–2025
Wahkiakum County grew by 453 people (+10.3%) between April 2020 and July 2025: 164 more deaths than births and a net gain of 625 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 4,446 |
| 2021 | 4,587 |
| 2022 | 4,693 |
| 2023 | 4,764 |
| 2024 | 4,813 |
| 2025 | 4,873 |
Neighboring counties
- Pacific County northwest · 24,357 people
- Clatsop County, Oregon southwest · 40,926 people
- Cowlitz County east · 114,885 people
- Columbia County, Oregon southeast · 54,091 people
- Lewis County east · 88,062 people
Printable Wahkiakum 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) (120 KB)
- PNG (2400 px) (79 KB)
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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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