The following highways are numbered 343:
Australia - Local Bendigo Highway
Canada Manitoba Provincial Road 343 Newfoundland and Labrador Route 343 Prince Edward Island Route 343 Quebec Route 343 Saskatchewan Highway 343
Japan Japan National Route 343
Nigeria A343 highway (Nigeria)
United States Connecticut Route 343 County Road 343 (Levy County, Florida) Georgia State Route 343 (former) Louisiana Highway 343 Maryland Route 343 M-343 (Michigan highway) New York: New York State Route 343 County Route 343 (Erie County, New York) North Carolina Highway 343 Ohio State Route 343 Pennsylvania Route 343 Puerto Rico Highway 343 Tennessee State Route 343 Texas: Texas State Highway 343 (former) Texas State Highway Loop 343 Virginia State Route 343 Wyoming Highway 343