The following highways are numbered 637:
Canada Ontario Highway 637 Saskatchewan Highway 637
Ireland R637 road (Ireland)
United States Route 637 (Connecticut) Kentucky Route 637 , Louisiana
, Maryland County Route 637 (Atlantic County, New Jersey) County Route 637 (Burlington County, New Jersey) County Route 637 (Camden County, New Jersey) County Route 637 (Cape May County, New Jersey) County Route 637 (Cumberland County, New Jersey) County Route 637 (Essex County, New Jersey) County Route 637 (Gloucester County, New Jersey) County Route 637 (Hudson County, New Jersey) County Route 637 (Mercer County, New Jersey) County Route 637 (Morris County, New Jersey) County Route 637 (Ocean County, New Jersey) County Route 637 (Passaic County, New Jersey) County Route 637 (Salem County, New Jersey) County Route 637 (Somerset County, New Jersey) County Route 637 (Sussex County, New Jersey) County Route 637 (Union County, New Jersey) County Route 637 (Warren County, New Jersey) , Ohio , Puerto Rico , Texas , Virginia