U.S. Route 20A (US 20A) is a 52.4-mile-long (84.3 km) east–west alternate route of US 20 located in northwest Ohio. The western terminus of the route is at US 20 southwest of Pioneer, and the eastern terminus is at US 20 in Maumee, southwest of Toledo.

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U.S. Route 20A
Route information
Maintained by ODOT
Length	52.448 mi[1] (84.407 km)
Existed	1935[2]–present
Major junctions
West end	US 20 west of Pioneer
Major intersections	I-80 / I-90 / Ohio Turnpike in Holiday City US 127 near West Unity SR 2 from Wauseon to Swanton
East end	US 20 in Maumee
Location
Country	United States
State	Ohio
Counties	Williams, Fulton, Lucas
Highway system
United States Numbered Highway System List Special Divided Ohio State Highway System Interstate US State Scenic
← SR 20 → US 21

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The route runs parallel to the Ohio Turnpike (Interstate 80/Interstate 90 [I-80/I-90]) for much of its length, and intersects the turnpike at exit 13 northeast of Montpelier in Holiday City. US 20 and US 20A are never more than five miles (8.0 km) apart for the entire 50-mile (80 km) stretch through the Ohio farm country, as the mainline of US 20 takes the more northerly route.^[3][4]

The current US 20A was designated U.S. Route 20S (US 20S) in 1932, which replaced State Route 271 (SR 271) which had run from US 20 south to Montpelier, truncated SR 107, joined SR 2, and followed a road formerly not on the state highway system through most of Lucas County. It became US 20A in 1935. US 20A was moved to its current location along SR 15 from SR 576 and SR 107 in 1964. (SR 107 then reclaimed some of the miles that had been taken from it in 1932.)^[2] In the 1950s, part of the road east of Swanton was abandoned to make way for Toledo Express Airport.^{[citation needed]}