Massachusetts Route 6A is the state road for two sections formerly known as U.S. Route 6 (US 6) on Cape Cod. Most of Route 6A is also known as the Old King's Highway. Combining the 2 major sections (and a "silent" concurrency with US 6 through Eastham, Wellfleet, and South Truro), the highway is approximately 62 miles (100 km) long.