This interactive choropleth map visualizes 2023 median home prices and sales volume for New York State counties. A sequential blue color scale encodes price magnitude, while hovering reveals a tooltip with county FIPS, median price, and sales count. The map uses D3.js v7 and TopoJSON with a `d3.geoMercator()` projection, drawing county paths via `d3.geoPath()` and loading data from a local CSV. The visualization includes a gradient legend and state boundary, with counties lacking data rendered in gray.