14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bayou Blue | 1 | 11,442 | 13,997 | -0.53% | 492 | 23 | CDP |
| Chackbay | 2 | 5,757 | 5,108 | 0.68% | 207 | 28 | CDP |
| Lafourche Crossing | 3 | 2,433 | 1,982 | 1.21% | 578 | 4 | CDP |
| Pierre Part | 4 | 2,267 | 1,815 | -2.58% | 738 | 3 | CDP |
| Belle Rose | 5 | 2,062 | 2,052 | 0.54% | 384 | 5 | CDP |
| Bayou L'Ourse | 6 | 2,054 | 2,231 | 0.24% | 754 | 3 | CDP |
| Labadieville | 7 | 1,469 | 1,302 | -1.74% | 378 | 4 | CDP |
| Paincourtville | 8 | 1,433 | 1,446 | 2.43% | 824 | 2 | CDP |
| Bayou Country Club | 9 | 1,240 | 1,363 | -0.8% | 1,594 | 1 | CDP |
| Choctaw | 10 | 589 | 938 | -3.13% | 94 | 6 | CDP |
| Napoleonville | 11 | 497 | 541 | -1.78% | 2,958 | 0 | Village |
| Supreme | 12 | 483 | 494 | -7.29% | 143 | 3 | CDP |
| Siracusaville | 13 | 356 | 387 | -1.11% | 446 | 1 | CDP |
| Bayou Corne | 14 | 26 | 54 | 8.33% | 72 | 0 | CDP |
Bayou Blue is the largest city in Assumption Parish, with a population of 11,442.
Bayou Corne is the smallest city in Assumption Parish, with a population of 26.
There are 14 cities in Assumption Parish, Louisiana.