12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Baraboo | 1 | 13,235 | 12,537 | 1.06% | 1,751 | 8 | City |
| Reedsburg | 2 | 10,376 | 10,064 | 0.6% | 1,705 | 6 | City |
| Sauk City | 3 | 3,459 | 3,518 | -0.35% | 2,158 | 2 | Village |
| Lake Delton | 4 | 3,456 | 3,504 | -0.29% | 452 | 8 | Village |
| Spring Green | 5 | 1,576 | 1,560 | 0.19% | 945 | 2 | Village |
| Plain | 6 | 721 | 745 | -0.69% | 793 | 1 | Village |
| North Freedom | 7 | 573 | 601 | -1.04% | 684 | 1 | Village |
| Merrimac | 8 | 527 | 520 | 0.19% | 640 | 1 | Village |
| Rock Springs | 9 | 357 | 324 | 1.71% | 275 | 1 | Village |
| La Valle | 10 | 338 | 388 | -2.87% | 849 | 0 | Village |
| Loganville | 11 | 289 | 299 | -0.69% | 1,091 | 0 | Village |
| Lime Ridge | 12 | 154 | 161 | -1.28% | 154 | 1 | Village |
Baraboo is the largest city in Sauk County, with a population of 13,235.
Lime Ridge is the smallest city in Sauk County, with a population of 154.
There are 12 cities in Sauk County, Wisconsin.