12 cities
| City | Parish | 2025 Pop. ↓ |
|---|---|---|
| Jefferson | Jefferson Parish | 9,878 |
| Jennings | Jefferson Davis Parish | 9,079 |
| Jeanerette | Iberia Parish | 4,448 |
| Jena | LaSalle Parish | 4,139 |
| Jonesboro | Jackson Parish | 3,957 |
| Jackson | East Feliciana Parish | 3,925 |
| Jean Lafitte | Jefferson Parish | 1,761 |
| Jonesville | Catahoula Parish | 1,554 |
| Junction City | Claiborne Parish | 410 |
| Jordan Hill | Winn Parish | 172 |
| Joyce | Winn Parish | 134 |
| Jamestown | Bienville Parish | 86 |