7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jennings | 1 | 9,079 | 9,811 | -1.58% | 860 | 10.56 | City |
| Welsh | 2 | 3,261 | 3,330 | -0.43% | 516 | 6.32 | Town |
| Lake Arthur | 3 | 2,549 | 2,589 | -0.31% | 1,375 | 1.85 | Town |
| Elton | 4 | 980 | 994 | -0.31% | 590 | 1.66 | Town |
| Roanoke | 5 | 252 | 550 | -7.35% | 589 | 0.43 | CDP |
| Fenton | 6 | 205 | 224 | -1.91% | 423 | 0.48 | Village |
| Lacassine | 7 | 76 | 57 | -26.21% | 43 | 1.75 | CDP |
Jennings is the largest city in Jefferson Davis Parish, with a population of 9,079.
Lacassine is the smallest city in Jefferson Davis Parish.
There are 7 cities in Jefferson Davis Parish, Louisiana.