Founded on Jan 4, 1844, Ohio County is one of 92 counties in the state of Indiana. Historically, Ohio County was formed from Dearborn County. The city of Rising Sun is the county seat. With FIPS code of 115, Ohio County has a population of 5,978 and area of 86 square miles (223 km2).
List of all cities in Ohio County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Rising Sun, IN | 47040 | 812 |