12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jennings | 1 | 9,150 | 9,825 | -1.4% | 866 | 11 | City |
| Jennings | 2 | 9,150 | 9,798 | -1.4% | 866 | 11 | City |
| Welsh | 3 | 3,261 | 3,333 | -0.43% | 516 | 6 | Town |
| Welsh | 4 | 3,261 | 3,330 | -0.43% | 516 | 6 | Town |
| Lake Arthur | 5 | 2,557 | 2,593 | -0.27% | 1,379 | 2 | Town |
| Lake Arthur | 6 | 2,557 | 2,591 | -0.27% | 1,379 | 2 | Town |
| Elton | 7 | 976 | 994 | -0.41% | 588 | 2 | Town |
| Elton | 8 | 976 | 993 | -0.41% | 588 | 2 | Town |
| Roanoke | 9 | 252 | 550 | -7.35% | 589 | 0 | CDP |
| Fenton | 10 | 213 | 231 | -1.84% | 439 | 0 | Village |
| Fenton | 11 | 213 | 230 | -1.84% | 439 | 0 | Village |
| Lacassine | 12 | 76 | 57 | -26.21% | 43 | 2 | CDP |
Jennings is the largest city in Jefferson Davis Parish, with a population of 9,150.
Lacassine is the smallest city in Jefferson Davis Parish, with a population of 76.
There are 12 cities in Jefferson Davis Parish, Louisiana.