4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lenoir City | 1 | 12,998 | 10,126 | 3.83% | 1,507 | 9 | City |
| Loudon | 2 | 7,402 | 6,022 | 3.21% | 585 | 13 | City |
| Greenback | 3 | 1,282 | 1,107 | 2.31% | 154 | 8 | City |
| Philadelphia | 4 | 718 | 610 | 2.57% | 462 | 2 | City |
Lenoir City is the largest city in Loudon County, with a population of 12,998.
Philadelphia is the smallest city in Loudon County, with a population of 718.
There are 4 cities in Loudon County, Tennessee.