J
Link for sources used to compile this list located at the top and bottom of the page.
| Name (& Source) | County | Notes/aka/twp |
|---|---|---|
| Jackson14 | Adams | name changed to Concord in 185014 |
| Jackson2 | Lawrence | . |
| Jackson Grove5 | Will | . |
| Jackson's Grove PO5 | Fulton | . |
| Jacksonville1, 2 | Morgan | . |
| Jacksonville5 | St. Clair | . |
| Jacob2 | Jackson | . |
| Jalapa2 | Greene | . |
| Jamaica2 | Vermilion | . |
| Jamesburg2 | Vermilion | . |
| Jamestown1, 2 | Clinton | . |
| Jamestown2 | Hamilton | historical |
| Jamestown2 | Perry | . |
| Janesville1 | Coles | . |
| Janesville2 | Cumberland | . |
| Jaques2 | Brown | . |
| Jarvis's Settlement5 | Warren | . |
| Jefferson City2 | Hamilton | historical |
| Jefferson City2 | Jefferson | . |
| Jefferson Corners2 | Whiteside | . |
| Jeffersonville1 | Wayne | . |
| Jeiseyville2 | Christian | South Fork twp |
| Jenkins2 | DeWitt | . |
| Jenkins2 | Williamson | . |
| Jernigan's BridgeU | Christian | . |
| Jerome2 | Sangamon | . |
| Jerseyville5 | Greene | . |
| Jerseyville1, 2 | Jersey | . |
| Jess2 | Sangamon | . |
| Jewett1, 2 | Cumberland | . |
| Jimtown2 | Champaign | . |
| Jimtown2 | Fayette | . |
| Job's Settlement5 | McDonough | . |
| Joetta1, 2 | Hancock | . |
| Johannisburg1, 2 | Washington | . |
| Johnsburg1, 2 | McHenry | . |
| Johnson's Settlement5 | Clinton | . |
| JohnsonsU | Logan | . |
| Johnsons Siding2 | Logan | . |
| Johnsonsport3 | Madison | 1823 Gazetteer |
| Johnsonville2 | Vermilion | . |
| Johnsonville1, 2 | Wayne | . |
| Johnston City2 | Williamson | . |
| Johnstown1, 2 | Cumberland | . |
| Joliet1, 2/Juliett5 | Will | . |
| Jones2 | Coles | . |
| Jones's Creek PO5 | Randolph | . |
| Jones Ferry6 | Calhoun | post office |
| Jones Ridge2 | Jackson | . |
| Jonesboro1, 2, 3 | Union | 1823 Gazetteer |
| Jonesville2 | La Salle | . |
| Jonesville1, 2 | Winnebago | . |
| Joppa1, 2 | Massac | . |
| Joppa Junction2 | Johnson | . |
| Jordan's Grove2 | Randolph | post office, historical |
| Jordan's Prairie5 | Jefferson | . |
| Jordan's Settlement5 | Jasper | . |
| Jordanville1, 2 | Morgan | historical |
| Joslin1, 2 | Rock Island | . |
| Joy1, 2 | Mercer | . |
| Joy Prairie2 | Morgan | . |
| Jubilee1 | Peoria | historical |
| Judson2 | Kankakee | historical |
| Jules1, 2 | Cass | . |
| Julien Hill1, 2 | Pope | . |
| Juliett5 | Will | aka Joliet |
| Junction1, 2 | Gallatin | . |
| Junction City1, 2 | Marion | . |
| Justice2 | Cook | . |
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