Founded in 1870, Clay County is one of 95 counties in the state of Tennessee. Historically, Clay County was formed from Jackson and Overton counties. The city of Celina is the county seat. With FIPS code of 27, Clay County has a population of 7,555 and area of 236 square miles (611 km2).
List of all cities in Clay County, TN alphabetically
| City/Town | Postal Code | Area Code |
| Celina, TN | 38551 | 931 |
| Moss, TN | 38575 | 931 |