Regional Library Districts by County Established by State Library Act of 1939

  • District 1: Jo Daviess, Stephenson, Winnebago, Boone, McHenry, Lake, Carroll, Ogle, DeKalb, Whiteside, Lee, Rock Island, Henry, Bureau, La Salle, Kendall, Stark, Putnam, Marshall, Grundy
  • District 2: Kane, Cook, DuPage, Will • District 3: Kankakee, Livingston, Iroquois, McLean, Ford, Vermillion, Champaign, DeWitt, Piatt, Macon, Christian, Shelby, Moultrie, Douglas, Edgar, Coles, Clark, Cumberland
  • District 4: Mercer, Knox, Peoria, Woodford, Tazewell, Fulton, Warren, Henderson, Hancock, McDonough, Adams, Schuyler, Mason, Logan, Menard, Cass, Brown, Pike, Morgan, Sangamon, Scott, Greene, Calhoun, Jersey
  • District 5: Macoupin, Montgomery, Madison, Bond, Fayette, Effingham, Jasper, Crawford, Lawrence, Richland, Clay, Marion, Clinton, St. Clair, Monroe, Washington, Jefferson, Perry, Randolph
  • District 6: Jackson, Franklin, Wayne, Edwards, Wabash, White, Hamilton, Gallatin, Saline, Williamson,