| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Stockton | 1 | 7,939 | 8,466 | -1.1% | 1,431 | 6 | City |
| Iraan | 2 | 985 | 1,058 | -1.3% | 1,596 | 1 | City |
Fort Stockton is the largest city in Pecos County, with a population of 7,939.
Iraan is the smallest city in Pecos County, with a population of 985.
There are 2 cities in Pecos County, Texas.