The following highways are numbered 142:

Cambodia

• National Road 142 (Cambodia)

Canada

• Nova Scotia Highway 142
• Prince Edward Island Route 142

Costa Rica

• National Route 142

Japan

• Japan National Route 142
• Fukuoka Prefectural Route 142
• Nara Prefectural Route 142

Malaysia

• Malaysia Federal Route 142

United States

• Alabama State Route 142
• Arkansas Highway 142
• California State Route 142
• Colorado State Highway 142
• Connecticut Route 142
• Florida State Road 142 (pre-1945) (former)
  • County Road 142 (Jefferson County, Florida)
  • County Road 142 (Leon County, Florida)
• Georgia State Route 142
• Illinois Route 142
  • Illinois Route 142A (former)
• Indiana State Road 142
• Iowa Highway 142 (former)
• Kentucky Route 142
• Louisiana Highway 142
• Maine State Route 142
• Maryland Route 142 (former)
• Massachusetts Route 142
• M-142 (Michigan highway)
• Missouri Route 142
• Nevada State Route 142 (former)
• New Hampshire Route 142
• New Mexico State Road 142
• New York State Route 142
  • County Route 142 (Cayuga County, New York)
  • County Route 142 (Erie County, New York)
  • County Route 142 (Fulton County, New York)
    • County Route 142A (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)
• North Carolina Highway 142
• Ohio State Route 142
• Oklahoma State Highway 142
• Pennsylvania Route 142 (former)
• Rhode Island Route 142 (former)
• Tennessee State Route 142
• Texas State Highway 142
  • Texas State Highway Loop 142
  • Farm to Market Road 142
• Utah State Route 142
• Vermont Route 142
• Virginia State Route 142
  • Virginia State Route 142 (1923-1926) (former)
  • Virginia State Route 142 (1932-1933) (former)
• Washington State Route 142
• Wisconsin Highway 142

Territories

• Puerto Rico Highway 142