| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Baraboo | 1 | 13,367 | 12,533 | 1.08% | 1,768 | 8 | City |
| Reedsburg | 2 | 10,708 | 10,068 | 0.63% | 1,759 | 6 | City |
| Lake Delton | 3 | 3,442 | 3,508 | -0.26% | 450 | 8 | Village |
| Sauk City | 4 | 3,428 | 3,514 | -0.32% | 2,138 | 2 | Village |
| Spring Green | 5 | 1,571 | 1,561 | 0.26% | 942 | 2 | Village |
| Plain | 6 | 712 | 743 | -0.7% | 783 | 1 | Village |
| North Freedom | 7 | 567 | 603 | -0.87% | 677 | 1 | Village |
| Merrimac | 8 | 524 | 518 | 0.19% | 637 | 1 | Village |
| Rock Springs | 9 | 355 | 326 | 2.01% | 273 | 1 | Village |
| La Valle | 10 | 335 | 389 | -2.9% | 842 | 0 | Village |
| Loganville | 11 | 283 | 299 | -0.7% | 1,068 | 0 | Village |
| Lime Ridge | 12 | 154 | 161 | -1.28% | 154 | 1 | Village |
Baraboo is the largest city in Sauk County, with a population of 13,367.
Lime Ridge is the smallest city in Sauk County, with a population of 154.
There are 12 cities in Sauk County, Wisconsin.