New York State Route 6B

U.S. Route 4
Map of New York with US 4 highlighted in red
Route information
Maintained by NYSDOT and the cities of Troy and Mechanicville
Length:	79.67 mi (128.22 km)
Existed:	1926 – present
Tourist routes:	Lakes to Locks Passage
Major junctions
South end:	US 9 / US 20 in East Greenbush
	I-90 in East Greenbush NY 7 in Troy NY 67 in Mechanicville NY 29 in Schuylerville NY 149 in Fort Ann
North end:	US 4 at the Vermont state line in Hampton
Location
Counties:	Rensselaer, Saratoga, Washington
Highway system
United States Numbered Highway System List Special Divided Replaced New York Highways Interstate U.S. State Reference Parkways ← NY 3A NY 5 → ← NY 6A NY 6N →

U.S. Route 4 (US 4) is a part of the U.S. Highway System that runs from East Greenbush, New York, to Portsmouth, New Hampshire. In the U.S. state of New York, US 4 extends 79.67 miles (128.22 km) from an intersection with US 9 and US 20 in East Greenbush to the Vermont state line northeast of Whitehall. While the remainder of US 4 east of New York is an east–west route, US 4 in New York is signed north–south due to the alignment the route takes through the state. The portion of the route between Waterford and Whitehall is part of the Lakes to Locks Passage, an All-American Road.

The route runs along the Hudson River from Troy to Hudson Falls and the Champlain Canal from Fort Ann to Whitehall. It passes through several riverside and canalside communities, including two cities (Troy and Mechanicville) and seven villages. US 4 crosses several major east–west highways as it proceeds north, such as Interstate 90 (I-90) in East Greenbush, New York State Route 7 (NY 7) in Troy, NY 29 in Schuylerville, and NY 149 in Fort Ann. It also overlaps with the north–south NY 22 for 6 miles (10 km) from to Whitehall and with NY 32 for a total of 16 miles (26 km) between Waterford and Bemis Heights and from Schuylerville to Northumberland.