11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monroe | 1 | 46,372 | 47,620 | -0.54% | 1,560 | 30 | City |
| West Monroe | 2 | 12,332 | 13,051 | -1.15% | 1,537 | 8 | City |
| Claiborne | 3 | 12,322 | 11,904 | 0.44% | 1,238 | 10 | CDP |
| Swartz | 4 | 4,870 | 5,176 | 0.45% | 599 | 8 | CDP |
| Brownsville | 5 | 4,168 | 3,718 | -0.24% | 1,199 | 3 | CDP |
| Richwood | 6 | 3,791 | 3,878 | -0.47% | 1,507 | 3 | Town |
| Lakeshore | 7 | 3,410 | 2,800 | 2.99% | 4,016 | 1 | CDP |
| Sterlington | 8 | 2,697 | 1,997 | 5.48% | 952 | 3 | Town |
| Bawcomville | 9 | 2,420 | 2,150 | -3.12% | 764 | 3 | CDP |
| Eros | 10 | 135 | 130 | 0.75% | 136 | 1 | Town |
| Calhoun | 11 | 77 | 265 | -34.19% | 33 | 2 | CDP |
Monroe is the largest city in Ouachita Parish, with a population of 46,372.
Calhoun is the smallest city in Ouachita Parish, with a population of 77.
There are 11 cities in Ouachita Parish, Louisiana.