- Mayport is a neighborhood located in the city of Jacksonville, Florida. It is situated along the St. Johns River and is known for its naval station, Mayport Naval Station, which is the third-largest naval facility in the United States. Mayport is also home to several beaches, including Kathryn Abbey Hanna Park and Little Talbot Island State Park. The area has a strong military presence, with numerous naval vessels and activity taking place at the naval station. Mayport is a popular destination for fishing, boating, and beach activities, and it offers a range of amenities including restaurants, shops, and recreational facilities.