5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jacksboro | 1 | 4,246 | 4,178 | 0.33% | 588 | 7.23 | City |
| Runaway Bay | 2 | 2,280 | 1,555 | 6.79% | 905 | 2.52 | City |
| Bryson | 3 | 478 | 430 | 2.14% | 363 | 1.32 | City |
| Lake Bridgeport | 4 | 391 | 336 | 2.89% | 837 | 0.47 | City |
| Perrin | 5 | 174 | 122 | -7.94% | 110 | 1.59 | CDP |
Jacksboro is the largest city in Jack County, with a population of 4,246.
Perrin is the smallest city in Jack County.
There are 5 cities in Jack County, Texas.