DistrictBuilder is a free and open source redistricting tool.Try it out
DistrictBuilder’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.
Fight for fair and transparent redistricting. DistrictBuilder empowers you to draw a better map.Try it out
Explore 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 representationStart now