The following highways are numbered 242:
Canada
Manitoba Provincial Road 242
Nova Scotia Route 242
Prince Edward Island Route 242
Costa Rica
National Route 242
Germany
Bundesstraße 242
Japan
Japan National Route 242
United States
Arkansas Highway 242
California State Route 242
Georgia State Route 242
Illinois Route 242
Iowa Highway 242 (former) Kentucky Route 242 Maryland Route 242 Minnesota State Highway 242 Missouri Route 242 Montana Secondary Highway 242 (former) New York State Route 242 North Carolina Highway 242 Ohio State Route 242 Oregon Route 242 Pennsylvania Route 242 (former) Tennessee State Route 242 Texas State Highway 242 Texas State Highway Spur 242 Farm to Market Road 242 (Texas) Utah State Route 242 (former) Vermont Route 242 Virginia State Route 242