15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Seiling | 1 | 799 | 849 | -1.24% | 674 | 1 | City |
| Seiling | 2 | 799 | 848 | -1.24% | 674 | 1 | City |
| Vici | 3 | 576 | 612 | -1.2% | 1,327 | 0 | Town |
| Vici | 4 | 576 | 611 | -1.2% | 1,327 | 0 | Town |
| Leedey | 5 | 388 | 413 | -1.27% | 862 | 0 | Town |
| Leedey | 6 | 388 | 412 | -1.27% | 862 | 0 | Town |
| Taloga | 7 | 272 | 289 | -1.45% | 527 | 1 | Town |
| Taloga | 8 | 272 | 289 | -1.45% | 527 | 1 | Town |
| Camargo | 9 | 180 | 192 | -1.64% | 723 | 0 | Town |
| Camargo | 10 | 180 | 192 | -1.64% | 723 | 0 | Town |
| Fay | 11 | 70 | 62 | 7.69% | 140 | 1 | CDP |
| Oakwood | 12 | 70 | 75 | -1.41% | 295 | 0 | Town |
| Oakwood | 13 | 70 | 75 | -1.41% | 295 | 0 | Town |
| Putnam | 14 | 27 | 27 | 0% | 318 | 0 | Town |
| Putnam | 15 | 27 | 27 | 0% | 318 | 0 | Town |
Seiling is the largest city in Dewey County, with a population of 799.
Putnam is the smallest city in Dewey County, with a population of 27.
There are 15 cities in Dewey County, Oklahoma.