| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lafayette | 1 | 123,618 | 121,457 | 0.25% | 2,190 | 56 | City |
| Youngsville | 2 | 20,720 | 16,025 | 3.7% | 1,651 | 13 | City |
| Broussard | 3 | 16,249 | 13,521 | 2.85% | 894 | 18 | City |
| Carencro | 4 | 14,111 | 9,328 | 6.71% | 1,796 | 8 | City |
| Scott | 5 | 9,954 | 8,170 | 3.31% | 848 | 12 | City |
| Henderson | 6 | 1,592 | 1,607 | -0.13% | 533 | 3 | Town |
| Duson | 7 | 1,357 | 1,345 | 0% | 451 | 3 | Town |
Lafayette is the largest city in Lafayette Parish, with a population of 123,618.
Duson is the smallest city in Lafayette Parish, with a population of 1,357.
There are 7 cities in Lafayette Parish, Louisiana.