List of highways numbered 166

The following highways are numbered 166:

Canada

• Prince Edward Island Route 166

India

• File:NH166-IN.svg National Highway 166 (India)

Japan

• File:Japanese National Route Sign 0166.svg Japan National Route 166

United Kingdom

• File:UK road A166.svg A166 road

United States

• File:US 166.svg U.S. Route 166
• File:Alabama 166.svg Alabama State Route 166
• File:Arizona 166.svg Arizona State Route 166 (former)
• File:California 166.svg California State Route 166
• File:Connecticut Highway 166.svg Connecticut Route 166
• File:Florida 166.svg Florida State Road 166
• File:Georgia 166.svg Georgia State Route 166
• File:Illinois 166.svg Illinois Route 166
• File:Indiana 166.svg Indiana State Road 166
• File:Elongated circle 166.svg Kentucky Route 166
• File:MA Route 166.svg Maine State Route 166
  • File:MA Route 166A.svg Maine State Route 166A
• File:MD Route 166.svg Maryland Route 166
• File:M-166.svg M-166 (Michigan highway)
• File:Nevada 166.svg Nevada State Route 166 (former)
• File:Ellipse sign 166.svg New Jersey Route 166
• File:New Mexico 166.svg New Mexico State Road 166
• File:NY-166.svg New York State Route 166
• File:OH-166.svg Ohio State Route 166
• File:Oklahoma State Highway 166.svg Oklahoma State Highway 166
• File:PA-166.svg Pennsylvania Route 166
• File:Secondary Tennessee 166.svg Tennessee State Route 166
• File:Texas 166.svg Texas State Highway 166
  • File:Texas Loop 166.svg Texas State Highway Loop 166
• File:Utah SR 166.svg Utah State Route 166 (former)
• File:Virginia 166.svg Virginia State Route 166
• File:WA-166.svg Washington State Route 166
• File:WIS 166.svg Wisconsin Highway 166 (former)

Territories

• File:PR secondary 166.svg Puerto Rico Highway 166

Preceded by 165

Lists of highways 166

Succeeded by 167