4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stromsburg | 1 | 1,158 | 1,150 | 0.17% | 1,144 | 1.01 | City |
| Osceola | 2 | 873 | 870 | 0.11% | 947 | 0.92 | City |
| Shelby | 3 | 744 | 718 | 0.68% | 1,380 | 0.54 | Village |
| Polk | 4 | 341 | 346 | -0.29% | 697 | 0.49 | Village |
Stromsburg is the largest city in Polk County, with a population of 1,158.
Polk is the smallest city in Polk County.
There are 4 cities in Polk County, Nebraska.