| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lenoir City | 1 | 13,045 | 10,111 | 4.11% | 1,512 | 9 | City |
| Loudon | 2 | 7,167 | 6,030 | 2.93% | 567 | 13 | City |
| Greenback | 3 | 1,284 | 1,097 | 2.64% | 154 | 8 | City |
| Philadelphia | 4 | 724 | 611 | 2.84% | 466 | 2 | City |
Lenoir City is the largest city in Loudon County, with a population of 13,045.
Philadelphia is the smallest city in Loudon County, with a population of 724.
There are 4 cities in Loudon County, Tennessee.