The following highways are numbered 409:

Canada

• Manitoba Provincial Road 409
• Ontario Highway 409

Costa Rica

• National Route 409

Japan

• Japan National Route 409

Norway

• Fylkesvei 409 (Aust-Agder) Arendal-Tromøya (Norwegian National Road 409) is a single lane ringed road on Tromøy Island and connected to Tromøysundet on the mainland via Tromøy Bridge in southwest Norway.

United States

• Georgia State Route 409 unsigned designation for Interstate 24
• Louisiana Highway 409
• Maryland Route 409 (former)
• New York:
  • New York State Route 409
  • New York State Route 409 (former)
  • County Route 409 (Albany County, New York)
  • County Route 409 (Erie County, New York)
• Pennsylvania Route 409
• Puerto Rico Highway 409
• Virginia State Route 409 (former)
• Washington State Route 409