15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Keener township | 1 | 11,136 | 10,706 | 0.74% | 231 | 48.12 | Township |
| Rensselaer | 2 | 5,662 | 5,716 | -0.19% | 842 | 6.73 | City |
| Wheatfield township | 3 | 4,604 | 4,415 | 0.66% | 106 | 43.36 | Township |
| DeMotte | 4 | 4,336 | 4,180 | 0.72% | 1,209 | 3.59 | Town |
| Walker township | 5 | 3,864 | 3,726 | 0.6% | 67 | 58.09 | Township |
| Carpenter township | 6 | 1,990 | 1,934 | 0.96% | 38 | 52.29 | Township |
| Union township | 7 | 1,596 | 1,549 | 0.44% | 28 | 56.40 | Township |
| Remington | 8 | 1,364 | 1,354 | 0.15% | 358 | 3.81 | Town |
| Wheatfield | 9 | 958 | 907 | 1.05% | 1,621 | 0.59 | Town |
| Kankakee township | 10 | 940 | 900 | 0.75% | 37 | 25.27 | Township |
| Barkley township | 11 | 916 | 879 | 0.77% | 15 | 59.90 | Township |
| Newton township | 12 | 810 | 783 | 0.62% | 24 | 34.30 | Township |
| Gillam township | 13 | 600 | 579 | 0.67% | 16 | 38.23 | Township |
| Jordan township | 14 | 335 | 328 | 0% | 9 | 37.44 | Township |
| Hanging Grove township | 15 | 236 | 230 | 0% | 8 | 29.90 | Township |
Keener township is the largest city in Jasper County, with a population of 11,136.
Hanging Grove township is the smallest city in Jasper County.
There are 15 cities in Jasper County, Indiana.