3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Parsons | 1 | 2,120 | 2,100 | 0.19% | 524 | 4.05 | City |
| Scotts Hill | 2 | 896 | 868 | 0.67% | 244 | 3.67 | Town |
| Decaturville | 3 | 806 | 803 | 0.12% | 488 | 1.65 | Town |
Parsons is the largest city in Decatur County, with a population of 2,120.
Decaturville is the smallest city in Decatur County.
There are 3 cities in Decatur County, Tennessee.