U.S. Route 302 is an east–west spur of U.S. Route 2 in northern New England in the United States. It currently runs 171 miles (275 km) from Montpelier, Vermont, beginning at US 2, to Portland, Maine, at U.S. Route 1. It passes through the states of Vermont, New Hampshire and Maine.

U.S. Route 2 (US 2) is a part of the United States Numbered Highway System that is split into two segments. Its eastern segment runs from Rouses Point, New York, to Houlton, Maine. In Vermont, US 2 extends 150.518 miles (242.235 km) from the New York state line in Alburgh to the New Hampshire state line in Guildhall. West of Vermont, US 2 continues into New York for another 0.87 miles (1.40 km) to an intersection with US 11 in Rouses Point. US 2 passes through the cities of Burlington and Montpelier as it traverses the state. The highway parallels Interstate 89 (I-89) between these two cities. The Burlington to Montpelier route was first laid out as a toll road in the early 19th century. It was later incorporated into the transcontinental auto trail known as the Theodore Roosevelt International Highway in 1919 before being designated as part of US 2 in 1926.