New Hampshire Route 4 is a 3.78-mile (6.08 km) state highway located in eastern Strafford County, New Hampshire. Its western terminus is at an intersection with New Hampshire Route 9 and New Hampshire Route 108 in Dover. Its northern terminus is at the Maine state border in Rollinsford, where it continues as Maine State Route 4.
NH 4 in Rollinsford, with South Berwick, ME in the distance