This map displays California zip codes with stroke fatality counts from 2016, using a Mercator projection. Hovering over a zip code highlights it in red, while tooltips reveal the count for each region. The visualization uses d3.geoMercator, d3.geoPath, and d3.zoom to render and navigate the geographic data. Zip code boundaries come from a GeoJSON file, joined with CSV data containing stroke counts, and the SVG is rendered with D3 v5.