9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lafayette | 1 | 121,475 | 121,455 | 0% | 2,169 | 56.02 | City |
| Youngsville | 2 | 19,314 | 16,033 | 3.52% | 1,539 | 12.55 | City |
| Broussard | 3 | 15,233 | 13,507 | 2.32% | 840 | 18.13 | City |
| Carencro | 4 | 14,817 | 9,371 | 7.93% | 1,886 | 7.86 | City |
| Scott | 5 | 9,088 | 8,187 | 2.02% | 775 | 11.73 | City |
| Ossun | 6 | 2,645 | 2,238 | 1.26% | 779 | 3.39 | CDP |
| Milton | 7 | 2,316 | 2,068 | -2.03% | 498 | 4.65 | CDP |
| Henderson | 8 | 1,586 | 1,608 | -0.25% | 531 | 2.99 | Town |
| Duson | 9 | 1,307 | 1,329 | -0.31% | 435 | 3.01 | Town |
Lafayette is the largest city in Lafayette Parish, with a population of 121,475.
Duson is the smallest city in Lafayette Parish.
There are 9 cities in Lafayette Parish, Louisiana.