11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lenoir City | 1 | 12,519 | 10,109 | 3.97% | 1,451 | 9 | City |
| Lenoir City | 2 | 12,519 | 10,126 | 3.97% | 1,451 | 9 | City |
| Loudon | 3 | 7,172 | 5,990 | 3.31% | 567 | 13 | City |
| Loudon | 4 | 7,172 | 6,022 | 3.31% | 567 | 13 | City |
| Tellico Village | 5 | 6,332 | 5,314 | 0.57% | 849 | 7 | CDP |
| Greenback | 6 | 1,253 | 1,101 | 2.37% | 151 | 8 | City |
| Greenback | 7 | 1,253 | 1,107 | 2.37% | 151 | 8 | City |
| Rarity Bay | 8 | 984 | 641 | 7.19% | 540 | 2 | CDP |
| Philadelphia | 9 | 700 | 607 | 2.64% | 450 | 2 | City |
| Philadelphia | 10 | 700 | 610 | 2.64% | 450 | 2 | City |
| Kahite | 11 | 661 | 667 | 7.13% | 508 | 1 | CDP |
Lenoir City is the largest city in Loudon County, with a population of 12,519.
Kahite is the smallest city in Loudon County, with a population of 661.
There are 11 cities in Loudon County, Tennessee.