List of highways numbered 637
The following highways are numbered 637:
Canada
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