12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bartlesville | 1 | 38,596 | 37,281 | 0.63% | 1,711 | 23 | City |
| Bartlesville | 2 | 38,596 | 37,390 | 0.63% | 1,711 | 23 | City |
| Dewey | 3 | 3,454 | 3,370 | 0.44% | 1,282 | 3 | City |
| Dewey | 4 | 3,454 | 3,379 | 0.44% | 1,282 | 3 | City |
| Copan | 5 | 735 | 701 | 0.82% | 698 | 1 | Town |
| Copan | 6 | 735 | 703 | 0.82% | 698 | 1 | Town |
| Ramona | 7 | 553 | 525 | 0.91% | 674 | 1 | Town |
| Ramona | 8 | 553 | 527 | 0.91% | 674 | 1 | Town |
| Ochelata | 9 | 446 | 426 | 0.68% | 683 | 1 | Town |
| Ochelata | 10 | 446 | 428 | 0.68% | 683 | 1 | Town |
| Vera | 11 | 338 | 324 | 0.6% | 427 | 1 | Town |
| Vera | 12 | 338 | 325 | 0.6% | 427 | 1 | Town |
Bartlesville is the largest city in Washington County, with a population of 38,596.
Vera is the smallest city in Washington County, with a population of 338.
There are 12 cities in Washington County, Oklahoma.