These county, state and country boundaries are extracted from a single TopoJSON file from us-atlas. Counties are stroked in thin gray, states in thin black, and the country in thick black. See also the fancy drop shadow variant.
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U.S. TopoJSON
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| license: gpl-3.0 | |
| height: 600 | |
| border: no |
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| <!DOCTYPE html> | |
| <svg width="960" height="600" fill="none" stroke="#000" stroke-linejoin="round" stroke-linecap="round"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/topojson-client@3"></script> | |
| <script> | |
| var svg = d3.select("svg"); | |
| var path = d3.geoPath(); | |
| d3.json("https://unpkg.com/us-atlas@1/us/10m.json", function(error, us) { | |
| if (error) throw error; | |
| svg.append("path") | |
| .attr("stroke", "#aaa") | |
| .attr("stroke-width", 0.5) | |
| .attr("d", path(topojson.mesh(us, us.objects.counties, function(a, b) { return a !== b && (a.id / 1000 | 0) === (b.id / 1000 | 0); }))); | |
| svg.append("path") | |
| .attr("stroke-width", 0.5) | |
| .attr("d", path(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))); | |
| svg.append("path") | |
| .attr("d", path(topojson.feature(us, us.objects.nation))); | |
| }); | |
| </script> |
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