Founded in 1845, Decatur County is one of 95 counties in the state of Tennessee. Historically, Decatur County was formed from Perry County. The city of Decaturville is the county seat. With FIPS code of 39, Decatur County has a population of 11,391 and area of 333 square miles (862 km2).
List of all cities in Decatur County, TN alphabetically
| City/Town | Postal Code | Area Code |
| Bath Springs, TN | 38311 | 731 |
| Decaturville, TN | 38329 | 731 |
| Parsons, TN | 38363 | 731 |
| Scotts Hill, TN | 38374 | 731 |
| Sugar Tree, TN | 38380 | 731 |