The following highways are numbered 406:
Canada Manitoba Provincial Road 406 Newfoundland and Labrador Route 406 Ontario Highway 406
Costa Rica National Route 406
Israel Route 406 (Israel)
Japan Japan National Route 406
United Kingdom North Circular Road, the top half of London's ring road from Chiswick in the West to the Woolwich Ferry in the East
United States Florida: Florida State Road 406 Florida State Road 406A County Road 406 (Brevard County, Florida) Georgia State Route 406 (unsigned designation for Interstate 59) Louisiana Highway 406 Maryland Route 406 (former) New Mexico State Road 406 New York: New York State Route 406 County Route 406 (Erie County, New York) Puerto Rico Highway 406 Virginia State Route 406 Virginia State Route 406 (former)