The following highways are numbered 234:

Australia

Borung Highway

Canada

• Manitoba Provincial Road 234
• Newfoundland and Labrador Route 234
• Prince Edward Island Route 234
• Quebec Route 234

Costa Rica

• National Route 234

India

• National Highway 234 (India)

Ireland

• R234 regional road

Italy

• Strada statale 234 Codognese

Japan

• Japan National Route 234

United States

• California State Route 234 (unbuilt)
• Florida State Road 234 (former)
• Georgia State Route 234
• Indiana State Road 234
• K-234 (Kansas highway)
• Kentucky Route 234
• Maine State Route 234
• Maryland Route 234
• Montana Secondary Highway 234
• New Mexico State Road 234
• New York State Route 234 (former)
• Oregon Route 234
• Pennsylvania Route 234
• Tennessee State Route 234
• Texas State Highway 234
  • Texas State Highway Loop 234
• Utah State Route 234 (former)
• Virginia State Route 234
• Wyoming Highway 234