23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Platteville | 1 | 10,654 | 11,838 | -2.18% | 1,723 | 6.18 | City |
| Lancaster | 2 | 3,885 | 3,912 | -0.13% | 1,292 | 3.01 | City |
| Boscobel | 3 | 3,163 | 3,297 | -0.85% | 975 | 3.24 | City |
| Fennimore | 4 | 2,753 | 2,768 | -0.11% | 1,590 | 1.73 | City |
| Cuba City | 5 | 2,114 | 2,144 | -0.28% | 1,822 | 1.16 | City |
| Muscoda | 6 | 1,233 | 1,305 | -1.12% | 770 | 1.60 | Village |
| Hazel Green | 7 | 1,177 | 1,176 | 0% | 925 | 1.27 | Village |
| Dickeyville | 8 | 1,016 | 1,018 | 0% | 1,004 | 1.01 | Village |
| Cassville | 9 | 767 | 776 | -0.26% | 738 | 1.04 | Village |
| Bloomington | 10 | 738 | 742 | -0.14% | 585 | 1.26 | Village |
| Montfort | 11 | 720 | 707 | 0.42% | 1,288 | 0.56 | Village |
| Potosi | 12 | 656 | 646 | 0.31% | 395 | 1.66 | Village |
| Livingston | 13 | 650 | 639 | 0.31% | 625 | 1.04 | Village |
| Blue River | 14 | 453 | 455 | 0% | 497 | 0.91 | Village |
| Kieler | 15 | 401 | 532 | -1.47% | 477 | 0.84 | CDP |
| Bagley | 16 | 359 | 354 | 0.28% | 503 | 0.71 | Village |
| Tennyson | 17 | 343 | 348 | -0.29% | 796 | 0.43 | Village |
| Sandy Hook | 18 | 249 | 251 | -1.58% | 177 | 1.41 | CDP |
| Mount Hope | 19 | 207 | 212 | -0.48% | 750 | 0.28 | Village |
| Patch Grove | 20 | 198 | 200 | 0% | 522 | 0.38 | Village |
| Boaz | 21 | 122 | 127 | -0.81% | 339 | 0.36 | Village |
| Woodman | 22 | 121 | 118 | 0.83% | 486 | 0.25 | Village |
| Glen Haven | 23 | 51 | 47 | 6.25% | 23 | 2.22 | CDP |
Platteville is the largest city in Grant County, with a population of 10,654.
Glen Haven is the smallest city in Grant County.
There are 23 cities in Grant County, Wisconsin.