Founded on Jan 5, 1821, Union County is one of 92 counties in the state of Indiana. Historically, Union County was formed from parts of Fayette, Franklin and Wayne counties. The city of Liberty is the county seat. With FIPS code of 161, Union County has a population of 7,047 and area of 161 square miles (417 km2).
List of all cities in Union County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Billingsville, IN | 47353 | 765 |
| Brownsville, IN | 47325 | 765 |
| Cottagegrove, IN | 47353 | 765 |
| Dunlapsville, IN | 47353 | 765 |
| Kitchell, IN | 47353 | 765 |
| Liberty, IN | 47353 | 765 |
| Lotus, IN | 47353 | 765 |
| Philomath, IN | 47325 | 765 |
| Roseburg, IN | 47353 | 765 |
| Springersville, IN | 47325 | 765 |
| Treaty Line Museum, IN | 47353 | 765 |
| Treaty Ln Mus, IN | 47353 | 765 |
| West College Corner, IN | 47003 | 317 |
| Witts, IN | 47353 | 765 |