The following highways are numbered 304:
Brazil BR-304
Canada Manitoba Provincial Road 304 Nova Scotia Route 304 Prince Edward Island Route 304 Saskatchewan Highway 304
China China National Highway 304
Costa Rica National Route 304
Hungary Main road 304 (Hungary)
Japan Japan National Route 304
Thailand Highway 304 (Thailand)
United Kingdom A304 road
United States Arkansas Highway 304 Arkansas Highway 304N Florida State Road 304 (former) Georgia State Route 304 (former) Louisiana Highway 304 Maryland Route 304 Mississippi Highway 304 Montana Secondary Highway 304 Nevada State Route 304 New Mexico State Road 304 New York State Route 304 North Carolina Highway 304 Ohio State Route 304 Pennsylvania Route 304 Pennsylvania Route 304 Truck South Carolina Highway 304 Tennessee State Route 304 Texas: Texas State Highway 304 Texas State Highway Loop 304 Farm to Market Road 304 Utah State Route 304 Virginia State Route 304 Washington State Route 304
Other areas: Puerto Rico Highway 304 U.S. Virgin Islands Highway 304