| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sparta | 1 | 9,963 | 10,038 | -0.11% | 1,246 | 8 | City |
| Tomah | 2 | 9,609 | 9,559 | 0.09% | 1,222 | 8 | City |
| Cashton | 3 | 1,175 | 1,160 | 0.09% | 922 | 1 | Village |
| Norwalk | 4 | 603 | 610 | -0.17% | 585 | 1 | Village |
| Warrens | 5 | 533 | 535 | -0.19% | 361 | 1 | Village |
| Wilton | 6 | 520 | 532 | -0.57% | 584 | 1 | Village |
| Kendall | 7 | 463 | 477 | -0.43% | 606 | 1 | Village |
| Oakdale | 8 | 308 | 301 | 0.33% | 416 | 1 | Village |
| Wyeville | 9 | 116 | 122 | -0.85% | 205 | 1 | Village |
Sparta is the largest city in Monroe County, with a population of 9,963.
Wyeville is the smallest city in Monroe County, with a population of 116.
There are 9 cities in Monroe County, Wisconsin.