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Illinois County Boundary Illinois Counties Illinois County Boundaries 1790-present 1790
Past Present La Salle County La 1877
Past Present Christian County Christian 1904
Past Present Greene County Greene 1905
Past Present Iroquois County Iroquois 1907
Past Present Kane County Kane 1878
Past Present Montgomery County Montgomery 1904
Past Present Piatt County Piatt 1903
Past Present Pike County Pike 1906
Past Present City of Decatur Macon County Decatur Macon 1903
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County County History Warren Illinois Portrait Biographical 1877