The following highways are numbered 422:
Canada Manitoba Provincial Road 422 Newfoundland and Labrador Route 422
Japan Route 422 (Japan)
United States Interstate 422 (future) U.S. Route 422 Georgia State Route 422 (unsigned designation for Georgia State Route 10 Loop) Louisiana Highway 422 Maryland Route 422 New York State Route 422 (former) Oregon Route 422 Oregon Route 422S Puerto Rico Highway 422 Tennessee State Route 422 Texas State Highway Spur 422
See also Special routes of U.S. Route 422