5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jacksboro | 1 | 4,774 | 4,182 | 2.53% | 661 | 7 | City |
| Runaway Bay | 2 | 2,264 | 1,557 | 6.64% | 899 | 3 | City |
| Bryson | 3 | 479 | 429 | 2.13% | 364 | 1 | City |
| Lake Bridgeport | 4 | 399 | 337 | 3.1% | 854 | 0 | City |
| Perrin | 5 | 174 | 122 | -7.94% | 110 | 2 | CDP |
Jacksboro is the largest city in Jack County, with a population of 4,774.
Perrin is the smallest city in Jack County, with a population of 174.
There are 5 cities in Jack County, Texas.