The following highways are numbered 306:
Canada Nova Scotia Route 306 Prince Edward Island Route 306 Saskatchewan Highway 306
China China National Highway 306
Costa Rica National Route 306
Hungary Main road 306 (Hungary)
India National Highway 306 (India)
Japan Japan National Route 306
Philippines N306 highway (Philippines)
United States Arkansas Highway 306 Florida State Road 306 (former) Georgia State Route 306 Iowa Highway 306 (former) Kentucky Route 306 Louisiana Highway 306 Maryland Route 306 Mississippi Highway 306 Montana Secondary Highway 306 Nevada State Route 306 New York: New York State Route 306 County Route 306 (Albany County, New York) County Route 306 (Erie County, New York) North Carolina Highway 306 Ohio State Route 306 Tennessee State Route 306 Texas State Highway 306 (former) Texas State Highway Loop 306 Farm to Market Road 306 Utah State Route 306 Virginia State Route 306 Washington State Route 306 (former)
Other areas: Puerto Rico Highway 306 U.S. Virgin Islands Highway 306