The following highways are numbered 266:
Canada Manitoba Provincial Road 266 Prince Edward Island Route 266
Japan Japan National Route 266
United Kingdom road B266 road
United States Interstate 266 (unbuilt) U.S. Route 266 Arizona State Route 266 Arkansas Highway 266 California State Route 266 Colorado State Highway 266 Georgia State Route 266 Indiana State Road 266 Iowa Highway 266 (former) K-266 (Kansas highway) Kentucky Route 266 Minnesota State Highway 266 (former) Missouri Route 266 Nevada State Route 266 New Mexico State Road 266 New York State Route 266 Ohio State Route 266 Oklahoma State Highway 266 Pennsylvania Route 266 (former) South Carolina Highway 266 Tennessee State Route 266 Texas State Highway 266 (former) Texas State Highway Loop 266 Farm to Market Road 266 (Texas) Utah State Route 266