D3 Examples - County Bubbles

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.land {
  fill: #ddd;
}
​
.border {
  fill: none;
  stroke: #fff;
  stroke-linejoin: round;
  stroke-linecap: round;
}
​
.bubble {
  fill: brown;
  fill-opacity: .5;
  stroke: #fff;
  stroke-width: .5px;
}
​
.bubble :hover {
  stroke: #000;
}
​
.legend circle {
  fill: none;
  stroke: #ccc;
}
​
.legend text {
  fill: #777;
  font: 10px sans-serif;
  text-anchor: middle;
}
​
</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 = 600;
​
var formatNumber = d3.format(",.0f");
​
var path = d3.geo.path()
    .projection(null);
​
var radius = d3.scale.sqrt()
    .domain([0, 1e6])
    .range([0, 15]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var legend = svg.append("g")
    .attr("class", "legend")
    .attr("transform", "translate(" + (width - 50) + "," + (height - 20) + ")")
  .selectAll("g")
    .data([1e6, 5e6, 1e7])
  .enter().append("g");
​
legend.append("circle")
    .attr("cy", function(d) { return -radius(d); })
    .attr("r", radius);
​
legend.append("text")
    .attr("y", function(d) { return -2 * radius(d); })
    .attr("dy", "1.3em")
    .text(d3.format(".1s"));
​
d3.json("us.json", function(error, us) {
  if (error) throw error;
​
  svg.append("path")
      .datum(topojson.feature(us, us.objects.nation))
      .attr("class", "land")
      .attr("d", path);
​
  svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
      .attr("class", "border border--state")
      .attr("d", path);
​
  svg.append("g")
      .attr("class", "bubble")
    .selectAll("circle")
      .data(topojson.feature(us, us.objects.counties).features
        .sort(function(a, b) { return b.properties.population - a.properties.population; }))
    .enter().append("circle")
      .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
      .attr("r", function(d) { return radius(d.properties.population); })
    .append("title")
      .text(function(d) {
        return d.properties.name
            + "\nPopulation " + formatNumber(d.properties.population);
      });
});
​
d3.select(self.frameElement).style("height", height + "px");
​
</script>
​
    