25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Baraboo | 1 | 13,235 | 12,556 | 1.06% | 1,801 | 7 | City |
| Baraboo | 2 | 13,235 | 12,537 | 1.06% | 1,801 | 7 | City |
| Reedsburg | 3 | 10,376 | 10,039 | 0.6% | 1,705 | 6 | City |
| Reedsburg | 4 | 10,376 | 10,064 | 0.6% | 1,705 | 6 | City |
| Sauk City | 5 | 3,459 | 3,520 | -0.35% | 2,158 | 2 | Village |
| Sauk City | 6 | 3,459 | 3,518 | -0.35% | 2,158 | 2 | Village |
| Lake Delton | 7 | 3,456 | 3,508 | -0.29% | 454 | 8 | Village |
| Lake Delton | 8 | 3,456 | 3,504 | -0.29% | 454 | 8 | Village |
| Spring Green | 9 | 1,576 | 1,563 | 0.19% | 945 | 2 | Village |
| Spring Green | 10 | 1,576 | 1,560 | 0.19% | 945 | 2 | Village |
| Plain | 11 | 721 | 746 | -0.69% | 793 | 1 | Village |
| Plain | 12 | 721 | 745 | -0.69% | 793 | 1 | Village |
| Bluffview | 13 | 584 | 731 | -1.85% | 1,517 | 0 | CDP |
| North Freedom | 14 | 573 | 602 | -1.04% | 684 | 1 | Village |
| North Freedom | 15 | 573 | 601 | -1.04% | 684 | 1 | Village |
| Merrimac | 16 | 527 | 521 | 0.19% | 640 | 1 | Village |
| Merrimac | 17 | 527 | 520 | 0.19% | 640 | 1 | Village |
| Rock Springs | 18 | 357 | 325 | 1.71% | 275 | 1 | Village |
| Rock Springs | 19 | 357 | 324 | 1.71% | 275 | 1 | Village |
| La Valle | 20 | 338 | 389 | -2.87% | 849 | 0 | Village |
| La Valle | 21 | 338 | 388 | -2.87% | 849 | 0 | Village |
| Loganville | 22 | 289 | 300 | -0.69% | 1,091 | 0 | Village |
| Loganville | 23 | 289 | 299 | -0.69% | 1,091 | 0 | Village |
| Lime Ridge | 24 | 154 | 161 | -1.28% | 154 | 1 | Village |
| Lime Ridge | 25 | 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 25 cities in Sauk County, Wisconsin.