14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Tishomingo | 1 | 3,038 | 3,098 | -0.39% | 576 | 5.28 | City |
| Mannsville | 2 | 732 | 726 | 0.14% | 241 | 3.04 | Town |
| Ravia | 3 | 459 | 463 | -0.22% | 810 | 0.57 | Town |
| Wapanucka | 4 | 384 | 386 | 0% | 591 | 0.65 | Town |
| Coleman | 5 | 371 | 327 | 7.23% | 97 | 3.82 | CDP |
| Mill Creek | 6 | 288 | 290 | 0% | 750 | 0.38 | Town |
| Milburn | 7 | 252 | 252 | 0% | 537 | 0.47 | Town |
| Kenefic | 8 | 162 | 149 | 1.89% | 163 | 1 | Town |
| Connerville | 9 | 156 | 147 | 6.85% | 78 | 2 | CDP |
| Bromide | 10 | 121 | 123 | 0% | 180 | 0.67 | Town |
| Pontotoc | 11 | 104 | 31 | 7.22% | 97 | 1.07 | CDP |
| Earl | 12 | 99 | 111 | 7.61% | 329 | 0.30 | CDP |
| Emet | 13 | 64 | 50 | 6.67% | 147 | 0.43 | CDP |
| Reagan | 14 | 50 | 47 | 6.38% | 56 | 0.89 | CDP |
Tishomingo is the largest city in Johnston County, with a population of 3,038.
Reagan is the smallest city in Johnston County.
There are 14 cities in Johnston County, Oklahoma.