15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| South Vacherie | 1 | 2,933 | 3,240 | -1.58% | 577 | 5.08 | CDP |
| Lutcher | 2 | 2,774 | 3,123 | -2.46% | 823 | 3.37 | Town |
| Gramercy | 3 | 2,640 | 2,917 | -2.04% | 1,311 | 2.01 | Town |
| Grand Point | 4 | 2,548 | 2,798 | 0.2% | 594 | 4.29 | CDP |
| Paulina | 5 | 2,269 | 1,761 | 3.32% | 491 | 4.62 | CDP |
| North Vacherie | 6 | 1,588 | 1,641 | -3.11% | 283 | 5.62 | CDP |
| Welcome | 7 | 840 | 937 | 0.36% | 185 | 4.54 | CDP |
| Hester | 8 | 758 | 598 | 2.29% | 219 | 3.46 | CDP |
| Lemannville | 9 | 612 | 980 | -2.7% | 604 | 1.01 | CDP |
| St. James | 10 | 571 | 596 | -2.89% | 68 | 8.39 | CDP |
| Convent | 11 | 512 | 415 | -2.66% | 132 | 3.89 | CDP |
| Union | 12 | 416 | 692 | -7.14% | 44 | 9.55 | CDP |
| Pleasure Bend | 13 | 276 | 300 | 0.73% | 66 | 4.20 | CDP |
| Moonshine | 14 | 109 | 127 | -5.22% | 299 | 0.36 | CDP |
| Romeville | 15 | 1 | 107 | -90% | 0.00 | 3.25 | 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.
There are 15 cities in St. James Parish, Louisiana.