The following highways are numbered 243:
Canada Manitoba Provincial Road 243 Prince Edward Island Route 243 Quebec Route 243
Costa Rica National Route 243
Japan Japan National Route 243
United Kingdom road B243 road
United States Alabama State Route 243 Arkansas Highway 243 California State Route 243 Connecticut Route 243 Florida State Road 243 Georgia State Route 243 Indiana State Road 243 Iowa Highway 243 (former) K-243 (Kansas highway) Kentucky Route 243 Maryland Route 243 Minnesota State Highway 243 Montana Secondary Highway 243 New Mexico State Road 243 New York State Route 243 Ohio State Route 243 Pennsylvania Route 243 (former) South Carolina Highway 243 Tennessee State Route 243 Texas State Highway 243 Farm to Market Road 243 (former) Ranch to Market Road 243 Utah State Route 243 Vermont Route 243 Virginia State Route 243 Washington State Route 243 Wisconsin Highway 243
See also List of highways numbered 242 List of highways numbered 244