7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jasper | 1 | 3,664 | 3,616 | 0.25% | 372 | 10 | Town |
| South Pittsburg | 2 | 2,939 | 3,089 | -1.01% | 358 | 8 | City |
| Kimball | 3 | 1,659 | 1,552 | 1.28% | 312 | 5 | Town |
| Powells Crossroads | 4 | 1,293 | 1,296 | -0.08% | 264 | 5 | Town |
| Sequatchie | 5 | 616 | 696 | 7.13% | 595 | 1 | CDP |
| Griffith Creek | 6 | 580 | 459 | 7.21% | 188 | 3 | CDP |
| Whiteside | 7 | 218 | 275 | 7.39% | 55 | 4 | CDP |
Jasper is the largest city in Marion County, with a population of 3,664.
Whiteside is the smallest city in Marion County, with a population of 218.
There are 7 cities in Marion County, Tennessee.