17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| South Vacherie | 1 | 2,933 | 3,240 | -1.58% | 577 | 5 | CDP |
| Lutcher | 2 | 2,823 | 3,138 | -2.08% | 837 | 3 | Town |
| Lutcher | 3 | 2,823 | 3,123 | -2.08% | 837 | 3 | Town |
| Gramercy | 4 | 2,669 | 2,930 | -1.84% | 1,326 | 2 | Town |
| Gramercy | 5 | 2,669 | 2,916 | -1.84% | 1,326 | 2 | Town |
| Grand Point | 6 | 2,548 | 2,798 | 0.2% | 594 | 4 | CDP |
| Paulina | 7 | 2,269 | 1,761 | 3.32% | 491 | 5 | CDP |
| North Vacherie | 8 | 1,588 | 1,641 | -3.11% | 283 | 6 | CDP |
| Welcome | 9 | 840 | 937 | 0.36% | 185 | 5 | CDP |
| Hester | 10 | 758 | 598 | 2.29% | 219 | 3 | CDP |
| Lemannville | 11 | 612 | 980 | -2.7% | 604 | 1 | CDP |
| St. James | 12 | 571 | 596 | -2.89% | 68 | 8 | CDP |
| Convent | 13 | 512 | 415 | -2.66% | 132 | 4 | CDP |
| Union | 14 | 416 | 692 | -7.14% | 44 | 10 | CDP |
| Pleasure Bend | 15 | 276 | 300 | 0.73% | 66 | 4 | CDP |
| Moonshine | 16 | 109 | 127 | -5.22% | 299 | 0 | CDP |
| Romeville | 17 | 1 | 107 | -90% | 0.00 | 3 | CDP |
South Vacherie is the largest city in St. James Parish, with a population of 2,933.
Romeville is the smallest city in St. James Parish, with a population of 1.
There are 17 cities in St. James Parish, Louisiana.