12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Amery | 1 | 2,949 | 2,966 | -0.1% | 949 | 3 | City |
| Osceola | 2 | 2,934 | 2,778 | 1.07% | 721 | 4 | Village |
| St. Croix Falls | 3 | 2,274 | 2,218 | 0.49% | 456 | 5 | City |
| Frederic | 4 | 1,139 | 1,159 | -0.35% | 674 | 2 | Village |
| Clear Lake | 5 | 1,109 | 1,091 | 0.36% | 426 | 3 | Village |
| Luck | 6 | 1,053 | 1,088 | -0.66% | 534 | 2 | Village |
| Dresser | 7 | 940 | 937 | 0.11% | 496 | 2 | Village |
| Milltown | 8 | 938 | 950 | -0.21% | 518 | 2 | Village |
| Balsam Lake | 9 | 910 | 939 | -0.66% | 409 | 2 | Village |
| Centuria | 10 | 897 | 891 | 0.11% | 528 | 2 | Village |
| Star Prairie | 11 | 653 | 675 | -0.61% | 305 | 2 | Village |
| Clayton | 12 | 542 | 551 | -0.37% | 169 | 3 | Village |
Amery is the largest city in Polk County, with a population of 2,949.
Clayton is the smallest city in Polk County, with a population of 542.
There are 12 cities in Polk County, Wisconsin.