| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stromsburg | 1 | 1,163 | 1,144 | 0.35% | 1,149 | 1 | City |
| Osceola | 2 | 888 | 872 | 0.57% | 963 | 1 | City |
| Shelby | 3 | 745 | 718 | 0.81% | 1,382 | 1 | Village |
| Polk | 4 | 340 | 346 | -0.29% | 695 | 0 | Village |
Stromsburg is the largest city in Polk County, with a population of 1,163.
Polk is the smallest city in Polk County, with a population of 340.
There are 4 cities in Polk County, Nebraska.