This interactive map of Texas displays counties, ZIP code boundaries, and major cities with pan, zoom, and layer-toggle controls. Built with D3.js v7 and TopoJSON, it renders geographic data through the `d3.geoPath` projection and supports custom GeoJSON/TopoJSON ZIP code uploads. Animated loading indicators and hover tooltips enhance the experience. Data sources include the US Atlas TopoJSON for state and county boundaries, plus OpenDataDE ZIP code collections.