U.S. Highway 32
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U.S. Highway 32, or US-32, is an early (1926) designation of an east-west highway between Chicago, Illinois and Council Bluffs, Iowa. Throughout most of its route, that is, its entirety west of Joliet, Illinois, the designation disappeared as U.S. Highway 6 was extended westward over the route of old US-32. Illinois preserved the designation US-32 for a Joliet-Chicago route (not to be confused with U.S. Highway 66!) for a few years before renumbering the highway as Illinois State Highway 7.
US-32 never had any "child" routes, and the US route number was never reassigned to any other highway.