4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stromsburg | 1 | 1,162 | 1,145 | 0.26% | 1,148 | 1 | City |
| Osceola | 2 | 888 | 870 | 0.34% | 963 | 1 | City |
| Shelby | 3 | 749 | 721 | 0.67% | 1,390 | 1 | Village |
| Polk | 4 | 344 | 347 | -0.29% | 703 | 0 | Village |
Stromsburg is the largest city in Polk County, with a population of 1,162.
Polk is the smallest city in Polk County, with a population of 344.
There are 4 cities in Polk County, Nebraska.