Sheridan Road in Illinois was once signed as Illinois Route 42. The route was first shown on official maps in 1924; the original route ran along Sheridan Road from the Wisconsin border to Waukegan, then turned west along Washington Street, south along Green Bay Road (now part of IL 131), east along Rockland Road (now part of IL 176) before running south along Waukegan Road (now mostly part of IL 43).
Sheridan Road in Illinois was previously designated as Illinois Route 42. The route first appeared on official maps in 1924; initially, it followed Sheridan Road from the Wisconsin border to Waukegan, then turned west along Washington Street, south along Green Bay Road (now part of IL 131), east along Rockland Road (now part of IL 176) before running south along Waukegan Road (now mostly part of IL 43).