Founded in 1815, Allen County is one of 120 counties in the state of Kentucky. Historically, Allen County was formed from Barren County and Warren County. The city of Scottsville is the county seat. With FIPS code of 3, Allen County has a population of 20,797 and area of 346 square miles (896 km2).
List of all cities in Allen County, KY alphabetically
| City/Town | Postal Code | Area Code |
| Adolphus, KY | 42120 | 270 |
| Gainesville, KY | 42164 | 270 |
| Halfway, KY | 42164 | 270 |
| Halifax, KY | 42164 | 270 |
| Holland, KY | 42153 | 270 |
| Scottsville, KY | 42164 | 270 |
| Trammel, KY | 42164 | 270 |