Founded in Mar 1, 1818, Logan County is one of 88 counties in the state of Ohio. Historically, Logan County was formed from Champaign County. The city of Bellefontaine is the county seat. With FIPS code of 91, Logan County has a population of 46,035 and area of 458.44 square miles (1,187 km2).
List of all cities in Logan County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Belle Center, OH | 43310 | 937 |
| Bellefontaine, OH | 43311 | 937 |
| De Graff, OH | 43318 | 937 |
| East Liberty, OH | 43319 | 937 |
| Huntsville, OH | 43324 | 937 |
| Lakeview, OH | 43331 | 937 |
| Lewistown, OH | 43333 | 937 |
| Middleburg, OH | 43336 | 937 |
| Orchard Island, OH | 43331 | 937 |
| Quincy, OH | 43343 | 937 |
| Rushsylvania, OH | 43347 | 937 |
| Russells Point, OH | 43348 | 937 |
| West Liberty, OH | 43357 | 937 |
| West Mansfield, OH | 43358 | 937 |
| Zanesfield, OH | 43360 | 937 |