17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Williamsport | 1 | 1,979 | 1,943 | 0.35% | 1,516 | 1.30 | Town |
| Pike township | 2 | 1,179 | 1,155 | 0.51% | 68 | 17.36 | Township |
| West Lebanon | 3 | 696 | 686 | 0.29% | 1,132 | 0.61 | Town |
| Pine township | 4 | 542 | 532 | 0.37% | 15 | 36.15 | Township |
| Adams township | 5 | 526 | 515 | 0.38% | 19 | 26.99 | Township |
| Medina township | 6 | 505 | 495 | 0.4% | 19 | 26.84 | Township |
| Steuben township | 7 | 505 | 497 | 0.4% | 13 | 39.55 | Township |
| Kent township | 8 | 436 | 432 | 0% | 31 | 14.01 | Township |
| Mound township | 9 | 422 | 421 | -0.24% | 25 | 16.57 | Township |
| Prairie township | 10 | 233 | 231 | 0% | 5 | 47.66 | Township |
| Jordan township | 11 | 232 | 225 | 0.87% | 6 | 40.55 | Township |
| Pine Village | 12 | 212 | 209 | 0.47% | 1,767 | 0.12 | Town |
| Pence | 13 | 204 | 132 | 7.37% | 1,207 | 0.17 | CDP |
| Judyville | 14 | 155 | 147 | 6.9% | 1,211 | 0.13 | CDP |
| Hedrick | 15 | 134 | 90 | 7.2% | 3,350 | 0.04 | CDP |
| State Line City | 16 | 123 | 122 | 0% | 885 | 0.14 | Town |
| Marshfield | 17 | 75 | 44 | 7.14% | 469 | 0.16 | CDP |
Williamsport is the largest city in Warren County, with a population of 1,979.
Marshfield is the smallest city in Warren County.
There are 17 cities in Warren County, Indiana.