13 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Omak | 1 | 5,319 | 4,862 | 1.45% | 1,412 | 4 | City |
| Okanogan | 2 | 2,548 | 2,371 | 1.19% | 1,267 | 2 | City |
| Brewster | 3 | 2,141 | 1,987 | 1.23% | 1,859 | 1 | City |
| Oroville | 4 | 1,960 | 1,812 | 1.29% | 1,160 | 2 | City |
| Coulee Dam | 5 | 1,256 | 1,213 | 0.56% | 1,754 | 1 | Town |
| Twisp | 6 | 1,169 | 998 | 2.54% | 1,000 | 1 | Town |
| Tonasket | 7 | 1,149 | 1,101 | 0.7% | 1,217 | 1 | City |
| Winthrop | 8 | 651 | 506 | 3.83% | 676 | 1 | Town |
| Pateros | 9 | 642 | 593 | 1.26% | 1,271 | 1 | City |
| Riverside | 10 | 348 | 324 | 1.16% | 392 | 1 | Town |
| Elmer City | 11 | 261 | 243 | 1.16% | 1,097 | 0 | Town |
| Nespelem | 12 | 205 | 189 | 1.49% | 1,057 | 0 | Town |
| Conconully | 13 | 201 | 191 | 1.01% | 953 | 0 | Town |
Omak is the largest city in Okanogan County, with a population of 5,319.
Conconully is the smallest city in Okanogan County, with a population of 201.
There are 13 cities in Okanogan County, Washington.