Together We can build a better map

DistrictBuilder puts the power of drawing electoral maps in the hands of the people. Redistricting can be a transparent process that represents communities fairly and prevents gerrymandering.

DistrictBuilder is a free and open source redistricting tool.

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Accurate down to the block

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.

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Screenshot of DistrictBuilder.

Uncover inequalities

Evaluate population demographics and visualize the effects of gerrymandering.

Build beautiful maps

Rapidly draw visually engaging and informative maps in our modern interface.

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Engage your audience

Easily export your custom map and share in an article, on social media, or anywhere online.

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.

Kind words What the redistricting community is saying

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.
Justin Villere
Managing Director at Draw the Lines PA
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!
@labor_law_dad

Advocacy groups are using DistrictBuilder to lead change

Fight for fair and transparent redistricting. DistrictBuilder empowers you to draw a better map.

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Delve deeper Redistricting resources and information

Explore questions of proportionality, competitiveness, contiguity, and more, as new legal decisions, public oversight, and technology change the criteria for drawing electoral districts.

Protestor talking to journalist on the street.

Build the map that demands fair representation

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