| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Boise City | 1 | 1,018 | 1,161 | -2.12% | 690 | 1 | City |
| Keyes | 2 | 238 | 272 | -2.46% | 659 | 0 | Town |
Boise City is the largest city in Cimarron County, with a population of 1,018.
Keyes is the smallest city in Cimarron County, with a population of 238.
There are 2 cities in Cimarron County, Oklahoma.