10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Eaton | 1 | 8,310 | 8,391 | -0.16% | 1,293 | 6 | City |
| Camden | 2 | 1,990 | 1,990 | 0% | 1,604 | 1 | Village |
| Lewisburg | 3 | 1,731 | 1,748 | -0.17% | 1,595 | 1 | Village |
| New Paris | 4 | 1,483 | 1,492 | -0.07% | 2,018 | 1 | Village |
| West Alexandria | 5 | 1,312 | 1,327 | -0.15% | 1,508 | 1 | Village |
| Gratis | 6 | 832 | 840 | -0.12% | 858 | 1 | Village |
| Eldorado | 7 | 454 | 457 | 0% | 1,983 | 0 | Village |
| West Manchester | 8 | 411 | 417 | -0.24% | 1,511 | 0 | Village |
| Verona | 9 | 399 | 405 | -0.25% | 875 | 0 | Village |
| West Elkton | 10 | 161 | 164 | 0% | 276 | 1 | Village |
Eaton is the largest city in Preble County, with a population of 8,310.
West Elkton is the smallest city in Preble County, with a population of 161.
There are 10 cities in Preble County, Ohio.