City | 2024 Population |
|---|---|
| Jackson | 3,256 |
| Jadis | 609 |
| Jamestown | 671 |
| Janesville | 2,483 |
| Janette Lake | 293 |
| Jasper | 590 |
| Jay | 224 |
| Jeffers | 335 |
| Jefferson | 138 |
| Jenkins | 504 |
| Jessenland | 425 |
| Jevne | 349 |
| Jewett | 50 |
| Jo Daviess | 225 |
| Johnson | 22 |
| Johnsonville | 122 |
| Jones | 257 |
| Jordan | 6,780 |
| Judson | 529 |
| Jupiter | 99 |