3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Parsons | 1 | 2,174 | 2,098 | 0.69% | 537 | 4 | City |
| Scotts Hill | 2 | 896 | 868 | 0.56% | 244 | 4 | Town |
| Decaturville | 3 | 819 | 804 | 0.37% | 496 | 2 | Town |
Parsons is the largest city in Decatur County, with a population of 2,174.
Decaturville is the smallest city in Decatur County, with a population of 819.
There are 3 cities in Decatur County, Tennessee.