5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monroe | 1 | 46,123 | 47,620 | -0.54% | 1,542 | 30 | City |
| West Monroe | 2 | 12,188 | 13,051 | -1.17% | 1,519 | 8 | City |
| Richwood | 3 | 3,774 | 3,878 | -0.45% | 1,500 | 3 | Town |
| Sterlington | 4 | 2,837 | 1,997 | 5.19% | 1,002 | 3 | Town |
| Eros | 5 | 136 | 130 | 0.74% | 137 | 1 | Town |
Monroe is the largest city in Ouachita Parish, with a population of 46,123.
Eros is the smallest city in Ouachita Parish, with a population of 136.
There are 5 cities in Ouachita Parish, Louisiana.