| City | County | 2026 Pop. ↓ |
|---|---|---|
| Jefferson | Jefferson Parish | 9,705 |
| Jennings | Jefferson Davis Parish | 9,110 |
| Jeanerette | Iberia Parish | 4,421 |
| Jonesboro | Jackson Parish | 4,288 |
| Jena | LaSalle Parish | 4,248 |
| Jackson | East Feliciana Parish | 3,883 |
| Jean Lafitte | Jefferson Parish | 1,865 |
| Jonesville | Catahoula Parish | 1,493 |
| Junction City | Claiborne Parish | 408 |
| Jordan Hill | Winn Parish | 225 |
| Joyce | Winn Parish | 215 |
| Jamestown | Bienville Parish | 90 |