12 cities
| City | Parish | 2026 Pop. ↓ |
|---|---|---|
| Jefferson | Jefferson Parish | 9,705 |
| Jennings | Jefferson Davis Parish | 9,021 |
| Jeanerette | Iberia Parish | 4,438 |
| Jena | LaSalle Parish | 4,115 |
| Jonesboro | Jackson Parish | 3,986 |
| Jackson | East Feliciana Parish | 3,906 |
| Jean Lafitte | Jefferson Parish | 1,818 |
| Jonesville | Catahoula Parish | 1,485 |
| Junction City | Claiborne Parish | 406 |
| Jordan Hill | Winn Parish | 225 |
| Joyce | Winn Parish | 215 |
| Jamestown | Bienville Parish | 90 |