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| The region that would become the state of Illinois became part of the Northwest Territory when it was formed in 1787 and then part of Indiana Territory when it was formed in 1800. Illinois Territory was created in 1809; and, at that time, included what would become Illinois, Wisconsin, and eastern Minnesota. Illinois achieved statehood in 1818. There were territorial censuses in Illinois before 1820. The entire 1890 census was lost. |
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| Illinois Counties
- Adams - Alexander - Bond - Boone - Brown - Bureau - Calhoun - Carroll - Cass - Champaign - Christian - Clark - Clay - Clinton - Coles - Cook - Crawford - Cumberland - DeKalb - De_Witt - Douglas - Du_Page - Edgar - Edwards - Effingham - Fayette - Ford - Franklin - Fulton - Gallatin - Greene - Grundy - Hamilton - Hancock - Hardin - Henderson - Henry - Iroquois - Jackson - Jasper - Jefferson - Jersey - Jo_Daviess - Johnson - Kane - Kankakee - Kendall - Knox - La_Salle - Lake - Lawrence - Lee - Livington - Logan - Macon - Macoupin - Madison - Marion - Marshall - Mason - Massac - McDonough - McHenry - McLean - Menard - Mercer - Monroe - Montgomery - Morgan - Moultrie - Ogle - Peoria - Perry - Piatt - Pike - Pope - Pulaski - Putnam - Randolph - Richland - Rock_Island - Saline - Sangamon - Schuyler - Scott - Shelby - St_Clair - Stark - Stephenson - Tazewell - Union - Vermilion - Wabash - Warren - Washington - Wayne - White - Whiteside - Will - Williamson - Winnebago - Woodford - |
| Adams
County
(formed in 1825 from Pike Co.)
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| Champaign
County
(formed in 1833 from Vermilion Co.)
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| Effingham
County
(formed in 1831 from Crawford and Fayette Cos.)
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| Franklin
County
(formed in 1818 from Gallatin and White Cos.)
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| Fulton
County
(formed in 1823 from Pike Co.)
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| Johnson
County
(formed in 1812 from Randolph Co.)
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| Knox
County
(formed in 1825 from unorganized territory plus Fulton and Henry Cos.)
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| Lake
County
(formed in 1839 from McHenry Co.)
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| Livingston
County
(formed in 1837 from unorganized territory, plus LaSalle and McLean Cos.)
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| McDonough
County
(formed in 1826 from Schuyler Co.)
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| Shelby
County
(formed in 1827 from Fayette Co.)
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| Everything I have is online at this web site; I have no further information. If you feel I've made an error, please don't hesitate to contact me. |
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| - County
(formed in
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