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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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