List of highways numbered 406

Canada

• Manitoba Provincial Road 406
• Newfoundland and Labrador Route 406
• Ontario Highway 406

  Costa Rica

• National Route 406

  Israel

• Route 406

  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
• Georgia State Route 406
• Louisiana Highway 406
• Maryland Route 406
• New Mexico State Road 406
• New York:
• * New York State Route 406
• * County Route 406
• Puerto Rico Highway 406
• Virginia State Route 406
• * Virginia State Route 406