The following highways are numbered 186:

R186 regional road

• Japan National Route 186

• A186 road
• B186 road

• Alabama State Route 186
• Arizona State Route 186
• Arkansas Highway 186
• California State Route 186
• Connecticut Route 186
• Georgia State Route 186
• Illinois Route 186 (former)
• K-186 (Kansas highway)
• Kentucky Route 186
• Maine State Route 186
• Maryland Route 186
• Massachusetts Route 186
• M-186 (Michigan highway)
• New Mexico State Road 186
• New York State Route 186
• North Carolina Highway 186
• Ohio State Route 186
• South Carolina Highway 186
• Tennessee State Route 186
• Texas State Highway 186
  • Texas State Highway Spur 186
  • Farm to Market Road 186 (Texas)
• Utah State Route 186
• Virginia State Route 186
• Wisconsin Highway 186

Territories

• Forest Highway 186 (Puerto Rico)