5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hendersonville | 1 | 64,861 | 62,119 | 0.71% | 2,049 | 32 | City |
| Gallatin | 2 | 56,321 | 44,825 | 3.52% | 1,578 | 36 | City |
| Portland | 3 | 13,870 | 13,213 | 0.8% | 916 | 15 | City |
| Westmoreland | 4 | 2,919 | 2,817 | 0.59% | 620 | 5 | Town |
| Mitchellville | 5 | 159 | 161 | 0% | 296 | 1 | City |
Hendersonville is the largest city in Sumner County, with a population of 64,861.
Mitchellville is the smallest city in Sumner County, with a population of 159.
There are 5 cities in Sumner County, Tennessee.