what county is mayport florida
Mayport (GNIS FID: 294073) is a populated place LOCATED WITHIN the City of Jacksonville. In turn, the City of Jacksonville is located within Duval County. Mayport is located at latitude 30.393 and longitude -81.431. The elevation of Mayport is 0 feet above mean sea level. Since Mayport is located within the City of Jacksonville, all of the census and demographic data for residents of Mayport are included as part of the information reported for City of Jacksonville in the Data tab above.