DistrictBuilder is a free and open source redistricting tool.
Try it outDistrictBuilder’s software gives you access to the same block-level data used in legal redistricting plans — for free. Come to the table with electoral maps that better reflect local communities and lead to fair representation.
We’re making DistrictBuilder the most useful redistricting tool it can be. View our product roadmap to find out what exciting features are coming soon.
Over 6,000 people, ranging in age from 13 through 70, used DistrictBuilder to draw their own congressional districts for the commonwealth of Pennsylvania. Our mappers loved the experience of using DistrictBuilder and the visualizations it creates.
I can't wait to see this tool become more fleshed out, it already has such great potential and I was having a LOT of fun with the tiny block groups. Keep up the great work!
Fight for fair and transparent redistricting. DistrictBuilder empowers you to draw a better map.
Try it outExplore questions of proportionality, competitiveness, contiguity, and more, as new legal decisions, public oversight, and technology change the criteria for drawing electoral districts.
We calculated which congressional districts have become over or underpopulated since they were last drawn.
Not sure where to begin? DistrictBuilder’s wiki has all the information you need to build your first map.
Want to learn more about Public Mapping? The Public Mapping Project book shares lessons learned, the tech, and how to DIY redistricting.
Build the map that demands fair representation
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