The following highways are numbered 188:
India State Highway 188 (Andhra Pradesh)
Ireland R188 road (Ireland)
Japan Japan National Route 188
United Kingdom road B188 road
United States Alabama State Route 188 Arizona State Route 188 California State Route 188 Connecticut Route 188 Florida State Road 188 Georgia State Route 188 Iowa Highway 188 K-188 (Kansas highway) Kentucky Route 188 Maine State Route 188 Maryland Route 188 M-188 (Michigan highway) New Mexico State Road 188 New York State Route 188 (former) Ohio State Route 188 Pennsylvania Route 188 South Carolina Highway 188 Tennessee State Route 188 Texas State Highway 188 Texas State Highway Spur 188 Farm to Market Road 188 (Texas) Urban Road 188 (Texas, signed as Farm to Market Road 188) Utah State Route 188 (former) Virginia State Route 188 Wisconsin Highway 188 Territories Puerto Rico Highway 188