Founded in Mar 1, 1808, Preble County is one of 88 counties in the state of Ohio. Historically, Preble County was formed from Montgomery and Butler Counties. The city of Eaton is the county seat. With FIPS code of 135, Preble County has a population of 40,867 and area of 424.80 square miles (1,100 km2).
List of all cities in Preble County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Camden, OH | 45311 | 937 |
| Eaton, OH | 45320 | 937 |
| Eldorado, OH | 45321 | 937 |
| Gratis, OH | 45330 | 937 |
| Lewisburg, OH | 45338 | 937 |
| Morning Sun, OH | 45311 | 937 |
| New Paris, OH | 45347 | 937 |
| Verona, OH | 45378 | 937 |
| West Alexandria, OH | 45381 | 937 |
| West Elkton, OH | 45070 | 937 |
| West Manchester, OH | 45382 | 937 |