According to the IRAD brochure I have it says: "IRAD is a resource sharing system that works with the Local Records Commission and area officials to transfer valuable records to seven IRAD centers at Illinois state universities" The IRAD location at No. Illinois University at DeKalb is supposed to have records for Jo Daviess, Stephenson, Winnebago, Boone, McHenry, Lake, Carroll, Ogle, DeKalb, Kane, DuPage, Bureau, LaSalle, Will, and Kendall counties. Roger Cramer Peoria, AZ