12 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jackson | 1 | 24,333 | 23,209 | 1.27% | 706 | 34 | Township |
| Seymour | 2 | 22,757 | 22,058 | 0.52% | 1,714 | 13 | City |
| Brownstown | 3 | 5,939 | 5,685 | 1.28% | 94 | 63 | Township |
| Redding | 4 | 5,453 | 5,217 | 1.34% | 160 | 34 | Township |
| Brownstown | 5 | 3,103 | 3,024 | 0.42% | 1,917 | 2 | Town |
| Owen | 6 | 1,672 | 1,576 | 1.64% | 31 | 55 | Township |
| Crothersville | 7 | 1,523 | 1,504 | 0.2% | 1,313 | 1 | Town |
| Carr | 8 | 1,412 | 1,340 | 1.44% | 34 | 41 | Township |
| Driftwood | 9 | 986 | 938 | 1.54% | 35 | 28 | Township |
| Grassy Fork | 10 | 709 | 689 | 1% | 18 | 40 | Township |
| Medora | 11 | 651 | 638 | 0.31% | 2,141 | 0 | Town |
| Salt Creek | 12 | 316 | 301 | 1.61% | 7 | 43 | Township |
Jackson is the largest city in Jackson County, with a population of 24,333.
Salt Creek is the smallest city in Jackson County, with a population of 316.
There are 12 cities in Jackson County, Indiana.