| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hendersonville | 1 | 64,763 | 62,113 | 0.77% | 2,046 | 32 | City |
| Gallatin | 2 | 56,541 | 44,838 | 3.57% | 1,584 | 36 | City |
| Portland | 3 | 13,776 | 13,190 | 0.86% | 910 | 15 | City |
| Westmoreland | 4 | 2,897 | 2,797 | 0.63% | 615 | 5 | Town |
| Mitchellville | 5 | 220 | 161 | -0.45% | 410 | 1 | City |
Hendersonville is the largest city in Sumner County, with a population of 64,763.
Mitchellville is the smallest city in Sumner County, with a population of 220.
There are 5 cities in Sumner County, Tennessee.