7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mounds | 1 | 590 | 655 | -2.16% | 489 | 1.21 | City |
| Mound City | 2 | 468 | 520 | -2.09% | 693 | 0.68 | City |
| Ullin | 3 | 437 | 466 | -1.35% | 155 | 2.81 | Village |
| Karnak | 4 | 391 | 423 | -1.51% | 217 | 1.81 | Village |
| Olmsted | 5 | 262 | 284 | -1.5% | 78 | 3.37 | Village |
| Pulaski | 6 | 137 | 152 | -2.14% | 105 | 1.31 | Village |
| Mill Creek | 7 | 53 | 57 | -1.85% | 141 | 0.38 | Village |
Mounds is the largest city in Pulaski County, with a population of 590.
Mill Creek is the smallest city in Pulaski County.
There are 7 cities in Pulaski County, Illinois.