U.S. Route 20 in New York - Suffixed Routes

Suffixed Routes

US 20 has had seven suffixed routes in New York; one U.S. Route (US 20A) and six New York state routes. All six state routes have been removed or redesignated; US 20A, however, still exists.

• US 20A (83.59 miles or 134.53 kilometres) is an alternate route of US 20 between Hamburg, Erie County, and East Bloomfield, Ontario County. It was assigned c. 1939.
• The NY 20A designation has been used for two distinct highways:
  • The first NY 20A was an alternate route of US 20 between the Pennsylvania state line at Ripley and Silver Creek in Chautauqua County. It was assigned as part of the 1930 renumbering of state highways in New York and supplanted by NY 5 c. 1932.
  • The second NY 20A was a short-lived alternate route of US 20 between Hamburg and Avon. It was assigned c. 1938 and largely replaced by US 20A by the following year.
• NY 20B was an alternate route of US 20 between Irving and Orchard Park in Erie County. It was assigned as part of the 1930 renumbering and supplanted by a realigned US 20 c. 1932.
• NY 20C was a loop route connecting US 20 to the then-village of Holcomb (now part of Bloomfield) in Ontario County. The route was assigned c. 1931 and partially replaced by NY 444 in 1997.
• NY 20D was a connector between then-US 20 in Geneseo and NY 5 in Avon. It was assigned c. 1931 and supplanted by NY 20A c. 1938. The route is now the northeasternmost portion of NY 39.
• NY 20N was an alternate route of US 20 between Marcellus, Onondaga County, and Cazenovia, Madison County. The route overlapped other, pre-existing routes for its entire length. It was assigned c. 1938 and removed c. 1962, leaving just the routes it overlapped.
• NY 20SY was an alternate route of US 20 between Skaneateles and Cazenovia in Onondaga and Madison counties. Like NY 20N, NY 20SY was concurrent with other, pre-existing routes for most of its length. It was assigned in the early 1950s and removed c. 1962, leaving just the routes it overlapped.