7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Orleans | 1 | 357,532 | 383,374 | -1.43% | 2,109 | 170 | City |
| Kenner | 2 | 64,240 | 66,290 | -0.63% | 4,315 | 15 | City |
| Gretna | 3 | 17,040 | 17,762 | -0.84% | 4,222 | 4 | City |
| Harahan | 4 | 8,749 | 9,098 | -0.79% | 4,335 | 2 | City |
| Westwego | 5 | 8,153 | 8,541 | -0.95% | 2,616 | 3 | City |
| Jean Lafitte | 6 | 1,816 | 1,809 | 0.06% | 310 | 6 | Town |
| Grand Isle | 7 | 987 | 1,005 | -0.4% | 154 | 6 | Town |
New Orleans is the largest city in Jefferson Parish, with a population of 357,532.
Grand Isle is the smallest city in Jefferson Parish, with a population of 987.
There are 7 cities in Jefferson Parish, Louisiana.