It runs 8+1⁄2 miles (13.7 km) from an intersection with U.S. Route 1 (US 1A) in Presque Isle to a junction with US 1A in Fort Fairfield.

[2] The route was originally designated in 1925, and ran between Lincoln and the Canada–United States border at Vanceboro.

In 1936, the number was given to a route between Presque Isle and Fort Fairfield.

[citation needed] The pavement entered Canada as New Brunswick Route 190.

The entire route is in Aroostook County.