High Quality Content by WIKIPEDIA articles! 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.