U.S. Route 20 in Pennsylvania

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U.S. Route 20
US 20 highlighted in red
Route information
Maintained by PennDOT
Length	45.433 mi[1] (73.117 km)
Existed	1926–present
Tourist routes	Great Lakes Seaway Trail Lake Erie Circle Tour
Major junctions
West end	US 20 at Ohio border near West Springfield
Major intersections	US 6N near West Springfield I-79 in Erie US 19 in Erie I-90 near North East
East end	US 20 at New York border near North East
Location
Country	United States
State	Pennsylvania
Counties	Erie
Highway system
United States Numbered Highway System List Special Divided Pennsylvania State Route System Interstate US State Scenic Legislative
← US 19 → PA 21
← PA 9 → PA 10

U.S. Route 20 (US 20) is an east–west United States Numbered Highway in Pennsylvania, which clips the northwestern corner of the state, running entirely in Erie County. While it is part of the nation's longest road, it features the shortest segment of any two-digit U.S. Route in the commonwealth. Although bypassed by Interstate 90 (I-90) as the primary through route in the area, heavy traffic has led to nearly the entire highway being widened to four lanes in width.