14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Laplace | 1 | 28,727 | 29,232 | -0.26% | 1,375 | 20.89 | CDP |
| Luling | 2 | 14,729 | 14,522 | 1.2% | 632 | 23.29 | CDP |
| Destrehan | 3 | 12,188 | 11,658 | 0.36% | 2,122 | 5.74 | CDP |
| St. Rose | 4 | 7,306 | 6,770 | -0.73% | 1,106 | 6.61 | CDP |
| Hahnville | 5 | 3,908 | 3,609 | 0.98% | 703 | 5.56 | CDP |
| Norco | 6 | 2,791 | 2,993 | -0.68% | 809 | 3.45 | CDP |
| Des Allemands | 7 | 2,299 | 1,976 | -0.56% | 231 | 9.95 | CDP |
| Montz | 8 | 2,113 | 2,037 | 0.62% | 764 | 2.77 | CDP |
| Boutte | 9 | 2,074 | 2,944 | -3.08% | 150 | 13.78 | CDP |
| Ama | 10 | 1,411 | 1,052 | 0.43% | 403 | 3.50 | CDP |
| New Sarpy | 11 | 1,059 | 1,265 | -2.49% | 780 | 1.36 | CDP |
| Paradis | 12 | 489 | 1,508 | -9.95% | 76 | 6.43 | CDP |
| Killona | 13 | 129 | 616 | -25.86% | 162 | 0.80 | CDP |
| Taft | 14 | 109 | 15 | 6.86% | 22 | 4.98 | CDP |
Laplace is the largest city in St. Charles Parish, with a population of 28,727.
Taft is the smallest city in St. Charles Parish.
There are 14 cities in St. Charles Parish, Louisiana.