Illinois (base map) JPEG format (243K) County boundaries and names, county seats, rivers. Original scale 1:2,500,000 U.S. Geological Survey, 1972 limited update 1990
Illinois (outline map) JPEG format (96K) County boundaries and names. U.S. Bureau of the Census, 1990
Illinois (reference map) JPEG format (308K) Shaded relief map with state boundaries, forest cover, place names, major highways. Portion of "The National Atlas of the United States of America. General Reference", compiled by U.S. Geological Survey 2001, printed 2002
Illinois (reference map) PDF format (248K) Shaded relief map with state boundaries, forest cover, place names, major highways. Portion of "The National Atlas of the United States of America. General Reference", compiled by U.S. Geological Survey 2001, printed 2002
