9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Miami | 1 | 12,806 | 12,956 | -0.23% | 1,154 | 11.10 | City |
| Commerce | 2 | 2,268 | 2,263 | 0.04% | 981 | 2.31 | City |
| Fairland | 3 | 1,107 | 1,101 | 0.09% | 988 | 1.12 | Town |
| Quapaw | 4 | 834 | 816 | 0.48% | 832 | 1 | Town |
| Afton | 5 | 734 | 733 | 0% | 353 | 2.08 | Town |
| Wyandotte | 6 | 493 | 487 | 0.2% | 363 | 1.36 | Town |
| North Miami | 7 | 298 | 288 | 0.68% | 1,577 | 0.19 | Town |
| Bluejacket | 8 | 248 | 237 | 0.81% | 570 | 0.43 | Town |
| Peoria | 9 | 129 | 126 | 0.78% | 531 | 0.24 | Town |
Miami is the largest city in Ottawa County, with a population of 12,806.
Peoria is the smallest city in Ottawa County.
There are 9 cities in Ottawa County, Oklahoma.