There are 22 cities in St. Martin Parish, Louisiana.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lafayette | 1 | 121,471 | 121,455 | 0% | 2,169 | 56.0 | City |
| New Iberia | 2 | 26,639 | 28,402 | -1.63% | 2,391 | 11.1 | City |
| Youngsville | 3 | 18,658 | 16,033 | 3.64% | 1,487 | 12.5 | City |
| Broussard | 4 | 14,888 | 13,507 | 2.37% | 821 | 18.1 | City |
| Morgan City | 5 | 10,695 | 11,406 | -1.64% | 1,787 | 6.0 | City |
| Breaux Bridge | 6 | 7,507 | 7,479 | 0.09% | 973 | 7.7 | City |
| St. Martinville | 7 | 5,205 | 5,404 | -0.95% | 1,642 | 3.2 | City |
| Berwick | 8 | 4,460 | 4,742 | -1.57% | 756 | 5.9 | Town |
| Bayou Vista | 9 | 3,836 | 4,346 | -1.52% | 2,129 | 1.8 | CDP |
| Pierre Part | 10 | 2,327 | 1,815 | -2.51% | 757 | 3.1 | CDP |
| Bayou L'Ourse | 11 | 2,049 | 2,231 | 0.24% | 752 | 2.7 | CDP |
| Cade | 12 | 2,000 | 2,053 | 1.01% | 298 | 6.7 | CDP |
| Amelia | 13 | 1,924 | 2,236 | -1.94% | 763 | 2.5 | CDP |
| Henderson | 14 | 1,590 | 1,608 | -0.31% | 532 | 3.0 | Town |
| Cecilia | 15 | 1,274 | 1,323 | -3.85% | 602 | 2.1 | CDP |
| Catahoula | 16 | 1,033 | 1,170 | -0.48% | 337 | 3.1 | CDP |
| Arnaudville | 17 | 999 | 999 | 0% | 1,439 | 0.7 | Town |
| Lydia | 18 | 980 | 1,326 | 0.2% | 576 | 1.7 | CDP |
| Leonville | 19 | 878 | 868 | 0.23% | 322 | 2.7 | Town |
| Grand Coteau | 20 | 760 | 772 | -0.39% | 314 | 2.4 | Town |
| Parks | 21 | 631 | 641 | -0.47% | 747 | 0.8 | Village |
| Siracusaville | 22 | 360 | 387 | -1.37% | 451 | 0.8 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Lafayette is the largest city in St. Martin Parish.
Siracusaville is the smallest city in St. Martin Parish.
There are 22 cities in St. Martin Parish, Louisiana.