Round Rock, TX

ZIP code 78683 is a PO Box postal designation associated with Round Rock, Williamson County, rather than a distinct neighborhood with mappable boundaries. Landmarks therefore cannot be reliably assigned to 78683 itself. Prominent attractions in the surrounding Round Rock area include Dell Diamond, Old Settlers Park, Kalahari Resorts & Conventions, and Round Rock Premium Outlets; their street addresses use other Round Rock ZIP codes.