Access DOQ files for Illinois by County

Illinois DOQ data is available by quarter-quadrangle in UTM Zones 15 or 16, NAD83. Each .zip file includes <filename>.sid and <filename>.sdw, which are the image file and a georeferencing file.


Adams Alexander Bond Boone Brown Bureau Calhoun
Carroll Cass Champaign Christian Clark Clay Clinton
Coles Cook Crawford Cumberland De Kalb Dewitt Douglas
DuPage Edgar Edwards Effingham Fayette Ford Franklin
Fulton Gallatin Greene Grundy Hamilton Hancock Hardin
Henderson Henry Iroquois Jackson Jasper Jefferson Jersey
Jodaviess Johnson Kane Kankakee Kendall Knox Lake
Lasalle Lawrence Lee Livingston 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 Stark St. Clair Stephenson Tazewell Union
Vermilion Wabash Warren Washington Wayne White Whiteside
Will Williamson Winnebago Woodford