| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Parsons | 1 | 2,173 | 2,091 | 0.51% | 537 | 4 | City |
| Scotts Hill | 2 | 898 | 863 | 0.56% | 245 | 4 | Town |
| Decaturville | 3 | 815 | 804 | 0.25% | 493 | 2 | Town |
Parsons is the largest city in Decatur County, with a population of 2,173.
Decaturville is the smallest city in Decatur County, with a population of 815.
There are 3 cities in Decatur County, Tennessee.