List of highways numbered 142
- Alabama State Route 142
- Arkansas Highway 142
- California State Route 142
- Colorado State Highway 142
- Connecticut Route 142
- County Road 142 (Jefferson County, Florida)
- County Road 142 (Leon County, Florida)
- County Route 142 (Cayuga County, New York)
- County Route 142 (Erie County, New York)
- County Route 142 (Fulton County, New York)
- County Route 142 (Montgomery County, New York)
- County Route 142 (Niagara County, New York)
- County Route 142 (Rensselaer County, New York)
- County Route 142 (Sullivan County, New York)
- County Route 142 (Tompkins County, New York)
- County Route 142A (Fulton County, New York)
- Farm to Market Road 142
- Florida State Road 142 (pre-1945)
- Georgia State Route 142
- Illinois Route 142
- Illinois Route 142A
- Indiana State Road 142
- Iowa Highway 142
- Japan National Route 142
- Kentucky Route 142
- Louisiana Highway 142
- M-142 (Michigan highway)
- Maine State Route 142
- Malaysia Federal Route 142
- Maryland Route 142
- Massachusetts Route 142
- Missouri Route 142
- National Road 142 (Cambodia)
- National Route 142 (Costa Rica)
- Nevada State Route 142
- New Hampshire Route 142
- New Mexico State Road 142
- New York State Route 142
- North Carolina Highway 142
- Nova Scotia Highway 142
- Ohio State Route 142
- Oklahoma State Highway 142
- Pennsylvania Route 142
- Prince Edward Island Route 142
- Puerto Rico Highway 142
- Rhode Island Route 142
- Tennessee State Route 142
- Texas State Highway 142
- Texas State Highway Loop 142
- Utah State Route 142
- Vermont Route 142
- Virginia State Route 142
- Virginia State Route 142 (1923-1926)
- Virginia State Route 142 (1932-1933)
- Washington State Route 142
- Wisconsin Highway 142