8969262 by mpmckenna8

A demo of TopoJSON on a U.S. counties shapefile from the U.S. census bureau. The same TopoJSON file can also be used to show states and counties.

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

path {
  fill: #ccc;
  stroke: #fff;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var path = d3.geo.path();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.json("/mbostock/raw/4090846/us.json", function(error, topology) {
  svg.append("path")
      .datum(topojson.feature(topology, topology.objects.land))
      .attr("d", path);
});

</script>