Founded in 1807, Rhea County is one of 95 counties in the state of Tennessee. Historically, Rhea County was formed from Roane County. The city of Dayton is the county seat. With FIPS code of 143, Rhea County has a population of 33,136 and area of 316 square miles (818 km2).
List of all cities in Rhea County, TN alphabetically
| City/Town | Postal Code | Area Code |
| Dayton, TN | 37321 | 423 |
| Evensville, TN | 37332 | 423 |
| Grand View, TN | 37337 | 423 |
| Graysville, TN | 37338 | 423 |
| Spring City, TN | 37337 | 423 |
| 37381 | 423 | |
| Watts Bar Dam, TN | 37381 | 423 |