The eastern terminus of NH 110 is in Berlin at New Hampshire Route 16 (White Mountain Road).

The western terminus of NH 110 is at U.S. Route 3 in the village of Groveton, town of Northumberland, on the Connecticut River.

[1][2] New Hampshire Route 110A (abbreviated NH 110A) is a 3.897-mile-long (6.272 km) connector road in the town of Milan, north of Berlin, United States.

The eastern terminus of NH 110A is at New Hampshire Route 16 (White Mountain Road) 12 miles (19.3 km) north of Berlin.

The eastern terminus of NH 110B is at New Hampshire Route 16 near the Berlin Regional Airport.