| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mounds | 1 | 588 | 654 | -2% | 487 | 1 | City |
| Mound City | 2 | 468 | 520 | -1.89% | 693 | 1 | City |
| Ullin | 3 | 452 | 479 | -1.09% | 161 | 3 | Village |
| Karnak | 4 | 388 | 422 | -1.52% | 215 | 2 | Village |
| Olmsted | 5 | 261 | 284 | -1.51% | 78 | 3 | Village |
| Pulaski | 6 | 139 | 154 | -2.11% | 106 | 1 | Village |
| Mill Creek | 7 | 51 | 55 | -1.92% | 136 | 0 | Village |
Mounds is the largest city in Pulaski County, with a population of 588.
Mill Creek is the smallest city in Pulaski County, with a population of 51.
There are 7 cities in Pulaski County, Illinois.