11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sparta | 1 | 9,943 | 10,042 | -0.2% | 1,243 | 8 | City |
| Tomah | 2 | 9,573 | 9,578 | -0.01% | 1,217 | 8 | City |
| Cashton | 3 | 1,156 | 1,159 | -0.09% | 907 | 1 | Village |
| Norwalk | 4 | 607 | 611 | -0.16% | 589 | 1 | Village |
| Warrens | 5 | 539 | 546 | -0.37% | 365 | 1 | Village |
| Wilton | 6 | 520 | 534 | -0.57% | 584 | 1 | Village |
| Kendall | 7 | 466 | 479 | -0.64% | 610 | 1 | Village |
| Oakdale | 8 | 303 | 300 | 0% | 409 | 1 | Village |
| Cataract | 9 | 171 | 166 | -0.58% | 288 | 1 | CDP |
| Tunnel City | 10 | 134 | 124 | 1.52% | 432 | 0 | CDP |
| Wyeville | 11 | 113 | 120 | -1.74% | 200 | 1 | Village |
Sparta is the largest city in Monroe County, with a population of 9,943.
Wyeville is the smallest city in Monroe County, with a population of 113.
There are 11 cities in Monroe County, Wisconsin.