13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Baraboo | 1 | 12,560 | 12,544 | 0.02% | 1,709 | 7.35 | City |
| Reedsburg | 2 | 10,294 | 10,033 | 0.51% | 1,691 | 6.09 | City |
| Lake Delton | 3 | 3,709 | 3,509 | 1.09% | 487 | 7.61 | Village |
| Sauk City | 4 | 3,444 | 3,521 | -0.43% | 2,148 | 1.60 | Village |
| Spring Green | 5 | 1,520 | 1,562 | -0.52% | 911 | 1.67 | Village |
| Plain | 6 | 722 | 746 | -0.69% | 794 | 0.91 | Village |
| Bluffview | 7 | 584 | 731 | -1.85% | 1,517 | 0.39 | CDP |
| North Freedom | 8 | 577 | 602 | -0.86% | 689 | 0.84 | Village |
| Merrimac | 9 | 518 | 518 | 0% | 629 | 0.82 | Village |
| La Valle | 10 | 369 | 389 | -1.07% | 927 | 0.40 | Village |
| Rock Springs | 11 | 323 | 327 | -0.31% | 249 | 1.30 | Village |
| Loganville | 12 | 283 | 300 | -1.05% | 1,068 | 0.27 | Village |
| Lime Ridge | 13 | 152 | 159 | -0.65% | 152 | 1 | Village |
Baraboo is the largest city in Sauk County, with a population of 12,560.
Lime Ridge is the smallest city in Sauk County.
There are 13 cities in Sauk County, Wisconsin.