| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dodgeville | 1 | 5,099 | 4,984 | 0.45% | 1,255 | 4 | City |
| Mineral Point | 2 | 2,552 | 2,578 | -0.12% | 830 | 3 | City |
| Barneveld | 3 | 1,334 | 1,320 | 0.08% | 636 | 2 | Village |
| Arena | 4 | 927 | 849 | 1.2% | 803 | 1 | Village |
| Highland | 5 | 858 | 873 | -0.23% | 754 | 1 | Village |
| Ridgeway | 6 | 656 | 631 | 0.92% | 511 | 1 | Village |
| Avoca | 7 | 545 | 555 | -0.37% | 242 | 2 | Village |
| Linden | 8 | 496 | 506 | -0.4% | 636 | 1 | Village |
| Cobb | 9 | 482 | 482 | 0.21% | 469 | 1 | Village |
| Hollandale | 10 | 299 | 311 | -0.66% | 410 | 1 | Village |
| Rewey | 11 | 251 | 257 | -0.4% | 495 | 1 | Village |
Dodgeville is the largest city in Iowa County, with a population of 5,099.
Rewey is the smallest city in Iowa County, with a population of 251.
There are 11 cities in Iowa County, Wisconsin.