NY 9A

New York State Route 9A
Map of the New York City area with NY 9A highlighted in red
Route information
Auxiliary route of US 9
Maintained by NYSDOT, NYCDOT, MTAB&T and the city of Yonkers
Length:	47.25 mi (76.04 km)
Existed:	1930 – present
Component highways:	Henry Hudson Parkway from Riverside South to Riverdale
Restrictions:	No commercial vehicles along Henry Hudson Parkway section
Major junctions
South end:	Battery Place in Battery Park
	FDR Drive in Battery Park City I-478 in Battery Park City I-95 / US 1 / US 9 in Fort Washington Park Henry Hudson Parkway / US 9 in Riverdale Saw Mill River Parkway in Yonkers I-87 / New York Thruway in Ardsley I-287 in Elmsford Saw Mill River Parkway in Mount Pleasant NY 100 / NY 141 in Hawthorne US 9 from Ossining to Croton
North end:	US 9 in Peekskill
Location
Counties:	New York, Bronx, Westchester
Highway system
New York Highways Interstate U.S. State Reference Parkways ← US 9 NY 9B → ← US 6 NY 6B →

New York State Route 9A (NY 9A) is a state highway in the vicinity of New York City in the United States. Its southern terminus is at the northern end of the Brooklyn–Battery Tunnel in New York City, where it intersects with both the unsigned Interstate 478 (I-478) and FDR Drive. The northern terminus of NY 9A is at U.S. Route 9 (US 9) in Peekskill. It is predominantly an alternate route of US 9 between New York City and Peekskill; however, in New York City, it is a major route of its own as it runs along the West Side Highway and Henry Hudson Parkway. In Westchester County, NY 9A follows the Briarcliff–Peekskill Parkway.

The origins of NY 9A date back to the 1920s when an alternate route of then-NY 6 from Yonkers to Tarrytown was designated as New York State Route 6A. NY 6 was redesignated as US 9 in 1927; however, NY 6A was not renumbered to NY 9A until the 1930 renumbering of state highways in New York. NY 9A was extended south into New York City in 1934 and north to Ossining in the late 1930s. In 1933, the Briarcliff–Peekskill Parkway opened as New York State Route 404. All of NY 404 was incorporated into an extended NY 9A on January 1, 1949. NY 9A was extended northward to Peekskill in 1967 following the completion of the Croton Expressway and southward to the Brooklyn–Battery Tunnel in the mid-1990s.