High Quality Content by WIKIPEDIA articles! 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 79.75 miles (128.35 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.