Route 10A is a 1.070-mile-long (1.722 km) east-west highway connecting the towns of Norwich, Vermont and Hanover, New Hampshire. The route exists as Vermont Route 10A and New Hampshire Route 10A, with each designation carrying about half of the route's length. The route begins in Norwich at an interchange with Interstate 91 and U.S. Route 5 and runs east, crossing the state line and continuing into downtown Hanover, where it ends at New Hampshire Route 10. Route 10A is a spur route of New Hampshire Route 10 and its extension in Vermont is unrelated to Vermont Route 10.