Weslaco, TX

ZIP code 78599 is a PO Box postal code associated with Weslaco, in Hidalgo County, Texas, rather than a distinct neighborhood with its own street-address area. Consequently, landmarks cannot be assigned to 78599 by geographic boundary. Notable Weslaco landmarks include Estero Llano Grande State Park, the Weslaco Museum, and the Valley Nature Center; these are city landmarks, not necessarily sites within the ZIP code’s postal designation.