| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monroe | 1 | 46,686 | 47,734 | -0.37% | 1,561 | 30 | City |
| West Monroe | 2 | 12,355 | 13,052 | -0.99% | 1,539 | 8 | City |
| Richwood | 3 | 3,822 | 3,884 | -0.31% | 1,519 | 3 | Town |
| Sterlington | 4 | 2,804 | 2,019 | 5.29% | 990 | 3 | Town |
| Eros | 5 | 143 | 130 | 1.42% | 144 | 1 | Town |
Monroe is the largest city in Ouachita Parish, with a population of 46,686.
Eros is the smallest city in Ouachita Parish, with a population of 143.
There are 5 cities in Ouachita Parish, Louisiana.