Founded in 1839, Union Parish is one of 64 parishes in the state of Louisiana. Historically, Union Parish was formed from part of Ouachita Parish. The city of Farmerville is the parish seat. With FIPS code of 111, Union Parish has a population of 21,091 and area of 905 square miles (2,344 km2).
List of all cities in Union Parish, LA alphabetically
| City/Town | Postal Code | Area Code |
| Bernice, LA | 71222 | 318 |
| Downsville, LA | 71234 | 318 |
| Eureka, LA | 71234 | 318 |
| Farmerville, LA | 71241 | 318 |
| Frost Town, LA | 71234 | 318 |
| Haile, LA | 71260 | 318 |
| Junction City, LA | 71256 | 318 |
| Lillie, LA | 71256 | 318 |
| Linville, LA | 71260 | 318 |
| Litroe, LA | 71260 | 318 |
| Lockhart, LA | 71277 | 318 |
| Marion, LA | 71260 | 318 |
| Mount Union, LA | 71277 | 318 |
| Oakland, LA | 71260 | 318 |
| Point, LA | 71234 | 318 |
| Rocky Branch, LA | 71241 | 318 |
| Shiloh, LA | 71222 | 318 |
| Spearsville, LA | 71277 | 318 |
| Weldon, LA | 71222 | 318 |
| Willhite, LA | 71234 | 318 |