14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Waseca | 1 | 9,217 | 9,227 | -0.02% | 2,146 | 4.29 | City |
| Janesville | 2 | 2,499 | 2,421 | 0.64% | 1,626 | 1.54 | City |
| Woodville township | 3 | 1,275 | 1,278 | 0% | 43 | 29.93 | Township |
| New Richland | 4 | 1,206 | 1,230 | -0.41% | 2,041 | 0.59 | City |
| Janesville township | 5 | 578 | 574 | 0.35% | 19 | 30.68 | Township |
| Blooming Grove township | 6 | 563 | 564 | 0% | 16 | 35.70 | Township |
| Otisco township | 7 | 548 | 544 | 0.37% | 15 | 36.02 | Township |
| Iosco township | 8 | 511 | 511 | 0% | 15 | 35.15 | Township |
| New Richland township | 9 | 432 | 433 | 0% | 12 | 35.35 | Township |
| Alton township | 10 | 424 | 422 | 0.24% | 12 | 34.83 | Township |
| St. Mary township | 11 | 404 | 402 | 0.25% | 11 | 35.53 | Township |
| Freedom township | 12 | 340 | 338 | 0.29% | 9 | 35.82 | Township |
| Vivian township | 13 | 224 | 227 | -0.44% | 6 | 35.90 | Township |
| Waldorf | 14 | 201 | 203 | 0% | 530 | 0.38 | City |
Waseca is the largest city in Waseca County, with a population of 9,217.
Waldorf is the smallest city in Waseca County.
There are 14 cities in Waseca County, Minnesota.