| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Williamson | 1 | 2,683 | 3,069 | -2.54% | 819 | 3 | City |
| Delbarton | 2 | 373 | 418 | -2.1% | 188 | 2 | Town |
| Matewan | 3 | 361 | 409 | -2.43% | 653 | 1 | Town |
| Gilbert | 4 | 294 | 328 | -2.33% | 295 | 1 | Town |
| Kermit | 5 | 279 | 315 | -2.45% | 712 | 0 | Town |
Williamson is the largest city in Mingo County, with a population of 2,683.
Kermit is the smallest city in Mingo County, with a population of 279.
There are 5 cities in Mingo County, West Virginia.