| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dayton | 1 | 7,901 | 7,387 | 1.05% | 929 | 9 | City |
| Spring City | 2 | 2,003 | 1,943 | 0.7% | 725 | 3 | Town |
| Graysville | 3 | 1,514 | 1,479 | 0.53% | 1,285 | 1 | Town |
Dayton is the largest city in Rhea County, with a population of 7,901.
Graysville is the smallest city in Rhea County, with a population of 1,514.
There are 3 cities in Rhea County, Tennessee.