Illinois Secretary of State; Rand McNally (1934). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. OCLC183709045. Retrieved September 13, 2020 – via Illinois Digital Archives.
Illinois Secretary of State; H.M. Gousha (1935). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. Retrieved September 13, 2020 – via Illinois Digital Archives.
Illinois Secretary of State; Rand McNally (1942). Illinois Road Map (Map). c. 1:918,720. Springfield: Illinois Secretary of State. Retrieved September 13, 2020 – via Illinois Digital Archives.
Illinois Division of Highways; Rand McNally (1971). Illinois Official Highway Map (Map). [1:772,500]. Springfield: Illinois Division of Highways. Retrieved September 13, 2020 – via Illinois Digital Archives.
Illinois Department of Transportation (1972). Illinois Official Highway Map (Map). [1:772,500]. Springfield: Illinois Department of Transportation. Retrieved September 13, 2020 – via Illinois Digital Archives.
Illinois Department of Transportation (1991). Illinois Highway Map (Map) (1991–1992 ed.). [1:762,500]. Springfield: Illinois Department of Transportation. Retrieved September 13, 2020 – via Illinois Digital Archives.
Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
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Illinois Secretary of State; Rand McNally (1934). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. OCLC183709045. Retrieved September 13, 2020 – via Illinois Digital Archives.