21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Patoka township | 1 | 11,662 | 11,575 | 0.15% | 170 | 68.45 | Township |
| Princeton | 2 | 8,460 | 8,312 | 0.36% | 1,545 | 5.47 | City |
| Patoka township | 3 | 7,918 | 7,818 | 0.22% | 202 | 39.26 | Township |
| Johnson township | 4 | 4,361 | 4,477 | -0.75% | 108 | 40.54 | Township |
| Union township | 5 | 4,276 | 4,398 | -0.72% | 85 | 50.31 | Township |
| Columbia township | 6 | 3,491 | 3,539 | -0.37% | 114 | 30.53 | Township |
| Fort Branch | 7 | 2,906 | 2,968 | -0.41% | 2,671 | 1.09 | Town |
| Patoka township | 8 | 2,787 | 2,827 | -0.25% | 65 | 42.62 | Township |
| Oakland City | 9 | 2,243 | 2,285 | -0.36% | 2,197 | 1.02 | City |
| Haubstadt | 10 | 1,612 | 1,636 | -0.31% | 2,261 | 0.71 | Town |
| Patoka township | 11 | 1,569 | 1,596 | -0.63% | 36 | 43.63 | Township |
| Princeton township | 12 | 1,562 | 1,526 | 0.9% | 25 | 62.53 | Township |
| White River township | 13 | 1,461 | 1,475 | -0.27% | 31 | 47.20 | Township |
| Barton township | 14 | 1,456 | 1,497 | -0.68% | 30 | 49.17 | Township |
| Owensville | 15 | 1,333 | 1,340 | -0.07% | 2,343 | 0.57 | Town |
| Center township | 16 | 1,247 | 1,279 | -0.64% | 33 | 37.58 | Township |
| Patoka | 17 | 708 | 705 | 0.14% | 594 | 1.19 | Town |
| Francisco | 18 | 530 | 540 | -0.38% | 869 | 0.61 | Town |
| Somerville | 19 | 248 | 250 | 0% | 695 | 0.36 | Town |
| Hazleton | 20 | 184 | 188 | -0.54% | 532 | 0.35 | Town |
| Mackey | 21 | 125 | 130 | -0.79% | 1,374 | 0.09 | Town |
Patoka township is the largest city in Gibson County, with a population of 11,662.
Mackey is the smallest city in Gibson County.
There are 21 cities in Gibson County, Indiana.