Founded in 1854, Wahkiakum County is one of 39 counties in the state of Washington. Historically, Wahkiakum County was formed from Cowlitz County. The city of Cathlamet is the county seat. With FIPS code of 69, Wahkiakum County has a population of 4,422 and area of 264 square miles (684 km2).
List of all cities in Wahkiakum County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Cathlamet, WA | 98612 | 360/564 |
| Grays River, WA | 98621 | 360/564 |
| Puget Island, WA | 98612 | 360/564 |
| Rosburg, WA | 98643 | 360/564 |
| Skamokawa, WA | 98647 | 360/564 |