| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cathlamet | 1 | 620 | 559 | 1.64% | 1,225 | 1 | Town |
Cathlamet is the largest city in Wahkiakum County, with a population of 620.
Cathlamet is the smallest city in Wahkiakum County, with a population of 620.
There is 1 city in Wahkiakum County, Washington.