Port Mansfield, TX

ZIP code 78598 is a PO-box postal code associated with South Padre Island, rather than the island’s standard street-delivery ZIP, 78597. Nearby island landmarks include Isla Blanca Park and its beaches at the southern tip, the Queen Isabella Causeway linking the island to the mainland, and the South Padre Island Birding, Nature Center & Alligator Sanctuary. These sites reflect the area’s coastal recreation and wildlife attractions.