11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monroe | 1 | 45,954 | 47,609 | -0.72% | 1,546 | 29.73 | City |
| Claiborne | 2 | 12,322 | 11,904 | 0.44% | 1,238 | 9.96 | CDP |
| West Monroe | 3 | 12,191 | 13,051 | -1.39% | 1,519 | 8.03 | City |
| Swartz | 4 | 4,870 | 5,176 | 0.45% | 599 | 8.13 | CDP |
| Brownsville | 5 | 4,168 | 3,718 | -0.24% | 1,199 | 3.48 | CDP |
| Richwood | 6 | 3,759 | 3,879 | -0.63% | 1,494 | 2.52 | Town |
| Lakeshore | 7 | 3,410 | 2,800 | 2.99% | 4,016 | 0.85 | CDP |
| Sterlington | 8 | 2,615 | 1,989 | 5.02% | 923 | 2.83 | Town |
| Bawcomville | 9 | 2,420 | 2,150 | -3.12% | 764 | 3.17 | CDP |
| Eros | 10 | 128 | 130 | 0% | 129 | 1 | Town |
| Calhoun | 11 | 77 | 265 | -34.19% | 33 | 2.36 | CDP |
Monroe is the largest city in Ouachita Parish, with a population of 45,954.
Calhoun is the smallest city in Ouachita Parish.
There are 11 cities in Ouachita Parish, Louisiana.