The following highways are numbered 450:
Canada Manitoba Provincial Road 450 New Brunswick Route 450 Newfoundland and Labrador Route 450
Japan Route 450 (Japan)
United States U.S. Route 450 (former) Florida State Road 450 Indiana State Road 450 Iowa Highway 450 Maryland Route 450 Mississippi Highway 450 New Mexico State Road 450 Ohio State Route 450 Puerto Rico Highway 450 Wyoming Highway 450