By county 102

• Adams3 House · 2 Senate
• Alexander1 House · 1 Senate
• Bond2 House · 1 Senate
• Boone4 House · 3 Senate
• Brown2 House · 1 Senate
• Bureau3 House · 3 Senate
• Calhoun1 House · 1 Senate
• Carroll1 House · 1 Senate
• Cass1 House · 1 Senate
• Champaign4 House · 2 Senate
• Christian4 House · 2 Senate
• Clark1 House · 1 Senate
• Clay1 House · 1 Senate
• Clinton2 House · 1 Senate
• Coles2 House · 1 Senate
• Cook57 House · 31 Senate
• Crawford1 House · 1 Senate
• Cumberland2 House · 2 Senate
• De Witt2 House · 1 Senate
• DeKalb5 House · 4 Senate
• Douglas2 House · 1 Senate
• DuPage16 House · 10 Senate
• Edgar1 House · 1 Senate
• Edwards1 House · 1 Senate
• Effingham3 House · 3 Senate
• Fayette1 House · 1 Senate
• Ford2 House · 2 Senate
• Franklin2 House · 2 Senate
• Fulton2 House · 1 Senate
• Gallatin1 House · 1 Senate
• Greene1 House · 1 Senate
• Grundy3 House · 3 Senate
• Hamilton2 House · 2 Senate
• Hancock1 House · 1 Senate
• Hardin1 House · 1 Senate
• Henderson1 House · 1 Senate
• Henry3 House · 3 Senate
• Iroquois1 House · 1 Senate
• Jackson2 House · 2 Senate
• Jasper1 House · 1 Senate
• Jefferson1 House · 1 Senate
• Jersey1 House · 1 Senate
• Jo Daviess1 House · 1 Senate
• Johnson1 House · 1 Senate
• Kane8 House · 5 Senate
• Kankakee3 House · 3 Senate
• Kendall4 House · 3 Senate
• Knox3 House · 2 Senate
• LaSalle5 House · 3 Senate
• Lake9 House · 5 Senate
• Lawrence1 House · 1 Senate
• Lee2 House · 1 Senate
• Livingston3 House · 2 Senate
• Logan1 House · 1 Senate
• Macon5 House · 3 Senate
• Macoupin2 House · 2 Senate
• Madison5 House · 3 Senate
• Marion2 House · 2 Senate
• Marshall2 House · 2 Senate
• Mason1 House · 1 Senate
• Massac1 House · 1 Senate
• McDonough2 House · 2 Senate
• McHenry5 House · 4 Senate
• McLean5 House · 3 Senate
• Menard1 House · 1 Senate
• Mercer2 House · 2 Senate
• Monroe1 House · 1 Senate
• Montgomery3 House · 2 Senate
• Morgan2 House · 1 Senate
• Moultrie2 House · 2 Senate
• Ogle2 House · 2 Senate
• Peoria5 House · 4 Senate
• Perry1 House · 1 Senate
• Piatt1 House · 1 Senate
• Pike1 House · 1 Senate
• Pope1 House · 1 Senate
• Pulaski1 House · 1 Senate
• Putnam1 House · 1 Senate
• Randolph1 House · 1 Senate
• Richland1 House · 1 Senate
• Rock Island4 House · 3 Senate
• Saline1 House · 1 Senate
• Sangamon4 House · 3 Senate
• Schuyler2 House · 2 Senate
• Scott1 House · 1 Senate
• Shelby1 House · 1 Senate
• St. Clair5 House · 4 Senate
• Stark2 House · 2 Senate
• Stephenson2 House · 1 Senate
• Tazewell5 House · 4 Senate
• Union1 House · 1 Senate
• Vermilion3 House · 2 Senate
• Wabash1 House · 1 Senate
• Warren2 House · 2 Senate
• Washington3 House · 2 Senate
• Wayne1 House · 1 Senate
• White2 House · 2 Senate
• Whiteside2 House · 1 Senate
• Will14 House · 8 Senate
• Williamson2 House · 1 Senate
• Winnebago4 House · 2 Senate
• Woodford3 House · 3 Senate

From the U.S. Census Bureau's Senate and House district boundaries laid over Illinois's county lines. A county split among several districts lists every member who represents part of it.