Pershing Road is an east-west street on the south side of Chicago and in its immediate western suburbs in Cook County, Illinois. It is precisely four miles south of Madison Street, the division point between north and south street numbering, and marks the 3900 South point in the region's street numbering system. Its western segment, more commonly referred to as 39th Street, runs east from a U.S. Route 34 (Ogden Avenue) in Lyons to Illinois Route 50 (Cicero Avenue) in Cicero. Its eastern segment, officially known as Pershing Road, runs east from a cul-de-sac at 3600 West to Oakwood Boulevard, which continues east ending at U.S. Route 41 (Lake Shore Drive). All of the eastern segment lies within the city of Chicago.