City | 2024 Population |
|---|---|
| Jackson | 1,205 |
| Jacksonville | 17,120 |
| Jamaica | 178 |
| Janesville | 50 |
| Jarvis | 16,143 |
| Jasper | 1,697 |
| Jeffersonville | 341 |
| Jeisyville | 99 |
| Jerome | 1,630 |
| Jersey | 9,784 |
| Jerseyville | 8,243 |
| Jewett | 195 |
| Johannisburg | 507 |
| Johnsburg | 6,394 |
| Johnson | 704 |
| Johnsonville | 69 |
| Johnston City | 3,284 |
| Joliet | 150,568 |
| Jonathan Creek | 1,058 |
| Jonesboro | 1,623 |
| Joppa | 328 |
| Jordan | 820 |
| Joshua | 427 |
| Joslin | 88 |
| Joy | 362 |
| Jubilee | 1,709 |
| Junction | 52 |
| Junction City | 517 |
| Justice | 11,920 |