Founded on Nov 11, 1814, Posey County is one of 92 counties in the state of Indiana. Historically, Posey County was formed from Gibson County and Warrick County. The city of Mount Vernon is the county seat. With FIPS code of 129, Posey County has a population of 25,116 and area of 410 square miles (1,062 km2).
List of all cities in Posey County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Blairsville, IN | 47638 | 812 |
| Bugtown, IN | 47633 | 812 |
| Cynthiana, IN | 47612 | 812 |
| Griffin, IN | 47616 | 812 |
| Mount Vernon, IN | 47620 | 812 |
| New Harmony, IN | 47631 | 812 |
| Parkers Settlement, IN | 47638 | 812 |
| Poseyville, IN | 47633 | 812 |
| Solitude, IN | 47620 | 812 |
| Stewartsville, IN | 47633 | 812 |
| Wadesville, IN | 47638 | 812 |