U.S. Route 20A in New York
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_map.svg)
Map of New York with US 20A highlighted in red
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| Route information | ||||
| Auxiliary route of US 20 | ||||
| Maintained by NYSDOT | ||||
| Length: | 83.59 mi (134.53 km) | |||
| Existed: | c. 1939 – present | |||
| Major junctions | ||||
| West end: |
 US 20 in Hamburg
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 US 219 in Orchard Park NY 400 in East Aurora NY 19 in Warsaw I-390 near Geneseo
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| East end: |
  US 20 / NY 5 / NY 64 in East Bloomfield
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| Location | ||||
| Counties: | Erie, Wyoming, Livingston, Ontario | |||
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U.S. Route 20A (US 20A) is an east–west alternate route of US 20 that extends for 83.59 miles (134.53 km) across the western portion of New York in the United States. It leaves US 20 in Hamburg, a suburb of Buffalo, and rejoins it in East Bloomfield about five miles (8 km) west of Canandaigua, the county seat of Ontario County. The western terminus is situated just northeast of the intersection of US 20 and US 62 and west of Ralph Wilson Stadium. At its east end, US 20A also meets New York State Route 5 (NY 5) and NY 64. Most of the route is known as Big Tree Road; outside Ralph Wilson Stadium, the highway is known as the Timothy J. Russert Highway in memory of Buffalo native Tim Russert.
While the main line of US 20 takes a direct path between Hamburg, Buffalo, and East Bloomfield via Avon, US 20A veers to the south to serve several villages and hamlets, including the villages of Geneseo and Warsaw. The town of Attica, famous for the Attica Prison riots of 1971, lies between US 20 and US 20A. As the route heads east, US 20A connects to several north–south freeways, such as NY 400 outside of East Aurora and Interstate 390 (I-390) between Geneseo and Lakeville. Outside of the communities that dot the highway, US 20A is a two-lane, rural highway.
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