3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Parsons | 1 | 2,189 | 2,098 | 0.69% | 541 | 4 | City |
| Scotts Hill | 2 | 902 | 868 | 0.67% | 246 | 4 | Town |
| Decaturville | 3 | 822 | 804 | 0.37% | 498 | 2 | Town |
Parsons is the largest city in Decatur County, with a population of 2,189.
Decaturville is the smallest city in Decatur County, with a population of 822.
There are 3 cities in Decatur County, Tennessee.