| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Picayune | 1 | 12,056 | 11,870 | 0.31% | 668 | 18 | City |
| Poplarville | 2 | 2,942 | 2,816 | 0.82% | 544 | 5 | City |
Picayune is the largest city in Pearl River County, with a population of 12,056.
Poplarville is the smallest city in Pearl River County, with a population of 2,942.
There are 2 cities in Pearl River County, Mississippi.