11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sparta | 1 | 9,718 | 10,027 | -0.63% | 1,215 | 8 | City |
| Tomah | 2 | 9,374 | 9,568 | -0.41% | 1,192 | 7.87 | City |
| Cashton | 3 | 1,171 | 1,160 | 0.17% | 918 | 1.27 | Village |
| Norwalk | 4 | 587 | 612 | -0.84% | 570 | 1.03 | Village |
| Warrens | 5 | 532 | 544 | -0.38% | 360 | 1.48 | Village |
| Wilton | 6 | 514 | 533 | -0.77% | 577 | 0.89 | Village |
| Kendall | 7 | 475 | 480 | -0.21% | 622 | 0.76 | Village |
| Oakdale | 8 | 306 | 303 | 0.33% | 413 | 0.74 | Village |
| Cataract | 9 | 171 | 166 | -0.58% | 288 | 0.59 | CDP |
| Tunnel City | 10 | 134 | 124 | 1.52% | 432 | 0.31 | CDP |
| Wyeville | 11 | 115 | 119 | -0.86% | 204 | 0.56 | Village |
Sparta is the largest city in Monroe County, with a population of 9,718.
Wyeville is the smallest city in Monroe County.
There are 11 cities in Monroe County, Wisconsin.