13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Williamsport | 1 | 1,955 | 1,945 | 0.1% | 1,498 | 1 | Town |
| Pike | 2 | 1,153 | 1,155 | -0.43% | 66 | 17 | Township |
| West Lebanon | 3 | 684 | 682 | 0% | 1,112 | 1 | Town |
| Pine | 4 | 523 | 527 | -0.76% | 14 | 36 | Township |
| Adams | 5 | 514 | 518 | -0.96% | 19 | 27 | Township |
| Steuben | 6 | 497 | 500 | -0.6% | 13 | 40 | Township |
| Medina | 7 | 494 | 495 | -0.6% | 18 | 27 | Township |
| Kent | 8 | 426 | 428 | -0.93% | 30 | 14 | Township |
| Mound | 9 | 424 | 422 | 0% | 26 | 17 | Township |
| Prairie | 10 | 229 | 231 | -0.87% | 5 | 48 | Township |
| Jordan | 11 | 225 | 225 | 0% | 6 | 41 | Township |
| Pine Village | 12 | 211 | 211 | 0% | 1,758 | 0 | Town |
| State Line City | 13 | 123 | 122 | 0% | 885 | 0 | Town |
Williamsport is the largest city in Warren County, with a population of 1,955.
State Line City is the smallest city in Warren County, with a population of 123.
There are 13 cities in Warren County, Indiana.