7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jasper | 1 | 3,624 | 3,616 | 0.06% | 368 | 9.85 | Town |
| South Pittsburg | 2 | 2,895 | 3,097 | -1.36% | 352 | 8.22 | City |
| Kimball | 3 | 1,644 | 1,551 | 1.17% | 310 | 5.31 | Town |
| Powells Crossroads | 4 | 1,270 | 1,299 | -0.47% | 259 | 4.90 | Town |
| Sequatchie | 5 | 616 | 696 | 7.13% | 595 | 1.03 | CDP |
| Griffith Creek | 6 | 580 | 459 | 7.21% | 188 | 3.09 | CDP |
| Whiteside | 7 | 218 | 275 | 7.39% | 55 | 3.96 | CDP |
Jasper is the largest city in Marion County, with a population of 3,624.
Whiteside is the smallest city in Marion County.
There are 7 cities in Marion County, Tennessee.