6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Breaux Bridge | 1 | 7,608 | 7,505 | 0.34% | 986 | 8 | City |
| Breaux Bridge | 2 | 7,608 | 7,478 | 0.34% | 986 | 8 | City |
| St. Martinville | 3 | 5,188 | 5,416 | -0.78% | 1,637 | 3 | City |
| St. Martinville | 4 | 5,188 | 5,390 | -0.78% | 1,637 | 3 | City |
| Cade | 5 | 2,019 | 2,053 | 0.95% | 301 | 7 | CDP |
| Cecilia | 6 | 1,224 | 1,323 | -3.92% | 578 | 2 | CDP |
Breaux Bridge is the largest city in St. Martin Parish, with a population of 7,608.
Cecilia is the smallest city in St. Martin Parish, with a population of 1,224.
There are 6 cities in St. Martin Parish, Louisiana.