| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bay St. Louis | 1 | 10,912 | 9,438 | 2.61% | 743 | 15 | City |
| Diamondhead | 2 | 9,415 | 9,510 | -0.28% | 931 | 10 | City |
| Waveland | 3 | 7,001 | 7,194 | -0.58% | 825 | 8 | City |
Bay St. Louis is the largest city in Hancock County, with a population of 10,912.
Waveland is the smallest city in Hancock County, with a population of 7,001.
There are 3 cities in Hancock County, Mississippi.