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    <p>You can go about this in two ways you can use tooltips or place the text on the map. These's been plenty of discussion about tooltips such <a href="https://groups.google.com/forum/#!msg/d3-js/-1oLMKUez3M/g3UjfyvKQIsJ" rel="nofollow">this google group conversation</a> and the links with in including these biovisualise links: <a href="http://bl.ocks.org/biovisualize/1016860" rel="nofollow">Simple tooltip</a> and <a href="http://bl.ocks.org/biovisualize/2973775" rel="nofollow">Tooltips as a helper</a>. In the bl.ocks example you've pointed at using the simple tooltips option would require adding 2 lines of code as in:</p> <pre><code> svg.selectAll(".symbol") .data(centroid.features.sort(function(a, b) { return b.properties.population - a.properties.population; })) .enter().append("path") .attr("class", "symbol") .attr("d", path.pointRadius(function(d) { return radius(d.properties.population); })) .append("title") .text(function (d) { return d.properties.name; }); </code></pre> <p>To add text to the map you need to append some svg text elements. So you need to setup something similar to the symbol block above and calculate the x and y for the text. There are probably more elegant way's of doing this but this makes it very explicit what's going on. The x's and y's are calculated by path.centroid which returns the screen coordinates of your point. </p> <pre><code>svg.selectAll("text") .data(centroid.features).enter() .append("text") .attr("x", function (d) { return path.centroid(d)[0]; }) .attr("y", function (d) { return path.centroid(d)[1]; }) .text(function (d) { return d.properties.name; }); </code></pre> <p>Hope this helps </p> <p>You can see both of them in action at this <a href="http://bl.ocks.org/phil-pedruco/7189721" rel="nofollow">bl.ock</a>. </p>
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    1. COThe second one works for me, but the first one isn't working. (Well, it is setting the title of the page to "California", but I don't think that's what you meant for it to do, and I can't figure out what it should say instead.
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    2. COThat is strange as it's working for me. Have a look at the bl.ock which added to the answer, it's got both working. With the title it appears when you hover over the population circle and if you're happy with the answer don't forget to accept it.
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    3. COAh, it is working. It takes a second to load, and I was too impatient ;)
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