15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rushville township | 1 | 7,821 | 7,669 | 0.92% | 178 | 43.91 | Township |
| Rushville | 2 | 6,188 | 6,195 | -0.02% | 1,801 | 3.44 | City |
| Ripley township | 3 | 2,127 | 2,065 | 1.14% | 60 | 35.68 | Township |
| Posey township | 4 | 1,083 | 1,047 | 1.21% | 30 | 36.26 | Township |
| Carthage | 5 | 929 | 918 | 0.22% | 1,644 | 0.56 | Town |
| Walker township | 6 | 856 | 833 | 1.06% | 29 | 29.93 | Township |
| Orange township | 7 | 811 | 790 | 1% | 22 | 36.28 | Township |
| Center township | 8 | 783 | 762 | 1.03% | 21 | 36.55 | Township |
| Union township | 9 | 746 | 723 | 1.08% | 21 | 35.50 | Township |
| Milroy | 10 | 689 | 650 | 0.88% | 1,041 | 0.66 | CDP |
| Noble township | 11 | 598 | 579 | 1.18% | 18 | 33.24 | Township |
| Arlington | 12 | 478 | 280 | 0.63% | 603 | 0.79 | CDP |
| Manilla | 13 | 411 | 481 | 2.49% | 1,819 | 0.23 | CDP |
| Jackson township | 14 | 346 | 340 | 0.58% | 15 | 22.60 | Township |
| Milroy township | 15 | 217 | 212 | 0% | 9 | 23.76 | Township |
Rushville township is the largest city in Rush County, with a population of 7,821.
Milroy township is the smallest city in Rush County.
There are 15 cities in Rush County, Indiana.