13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Williamson | 1 | 2,707 | 3,080 | -2.59% | 827 | 3 | City |
| Williamson | 2 | 2,707 | 3,066 | -2.59% | 827 | 3 | City |
| Chattaroy | 3 | 612 | 585 | -1.61% | 300 | 2 | CDP |
| Red Jacket | 4 | 495 | 255 | -1% | 94 | 5 | CDP |
| Delbarton | 5 | 380 | 420 | -2.06% | 191 | 2 | Town |
| Delbarton | 6 | 380 | 418 | -2.06% | 191 | 2 | Town |
| Matewan | 7 | 365 | 412 | -2.41% | 660 | 1 | Town |
| Matewan | 8 | 365 | 410 | -2.41% | 660 | 1 | Town |
| Justice | 9 | 296 | 584 | -2.63% | 224 | 1 | CDP |
| Gilbert | 10 | 296 | 329 | -2.31% | 297 | 1 | Town |
| Gilbert | 11 | 296 | 328 | -2.31% | 297 | 1 | Town |
| Kermit | 12 | 282 | 317 | -2.42% | 719 | 0 | Town |
| Kermit | 13 | 282 | 316 | -2.42% | 719 | 0 | Town |
Williamson is the largest city in Mingo County, with a population of 2,707.
Kermit is the smallest city in Mingo County, with a population of 282.
There are 13 cities in Mingo County, West Virginia.