13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Othello | 1 | 9,111 | 8,548 | 1.22% | 2,221 | 4 | City |
| Othello | 2 | 9,111 | 8,558 | 1.22% | 2,221 | 4 | City |
| Ritzville | 3 | 1,700 | 1,749 | -0.53% | 772 | 2 | City |
| Ritzville | 4 | 1,700 | 1,744 | -0.53% | 772 | 2 | City |
| Lind | 5 | 521 | 538 | -0.57% | 471 | 1 | Town |
| Lind | 6 | 521 | 536 | -0.57% | 471 | 1 | Town |
| Marine View | 7 | 420 | 435 | 7.14% | 469 | 1 | CDP |
| Washtucna | 8 | 197 | 206 | -1.01% | 298 | 1 | Town |
| Washtucna | 9 | 197 | 205 | -1.01% | 298 | 1 | Town |
| Hatton | 10 | 156 | 79 | 10.64% | 419 | 0 | Town |
| Hatton | 11 | 156 | 79 | 10.64% | 419 | 0 | Town |
| Krupp | 12 | 44 | 46 | -2.22% | 75 | 1 | Town |
| Krupp | 13 | 44 | 46 | -2.22% | 75 | 1 | Town |
Othello is the largest city in Adams County, with a population of 9,111.
Krupp is the smallest city in Adams County, with a population of 44.
There are 13 cities in Adams County, Washington.