The following highways are numbered 255:
Canada Manitoba Provincial Road 255 New Brunswick Route 255 Nova Scotia Route 255 Quebec Route 255 Saskatchewan Highway 255
Costa Rica National Route 255
Japan Japan National Route 255
Korea, South Gangjin–Gwangju Expressway
United Kingdom road B255 road
United States Interstate 255 Alabama State Route 255 Arkansas Highway 255 California State Route 255 Florida State Road 255 (former) Georgia State Route 255 Illinois Route 255 K-255 (Kansas highway) Kentucky Route 255 Maryland Route 255 Montana Secondary Highway 255 New Mexico State Road 255 New York State Route 255 (former) Ohio State Route 255 Oregon Route 255 Pennsylvania Route 255 Tennessee State Route 255 Texas State Highway 255 Utah State Route 255 (former) Virginia State Route 255 Wyoming Highway 255