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The political atlas165 years of elections21M+ results

Every geographythat decides an election.

One data layer, every tier — from the 51 states down to 31,871 census places, modeled onto 8 million blocks. Elections back to 1868, demographics joined in, and pgvector similarity so you can find places that behave like yours.

Place dossier section

States & Territories

51

Presidential margins for all 50 states and DC

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Place dossier section

Counties

3,143

The closest battleground counties in the latest presidential election

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Showing the 18 closest counties by presidential margin. Browse all counties via any state page.

Place dossier section

Congressional Districts

435

The most competitive districts by presidential margin

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Showing the 18 most competitive districts. 2026-adopted / 120th Congress boundaries.

Place dossier section

More Places

39,844

State legislative districts, metros, media markets, and cities

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Place dossier section

View places through a lens

3

Cross-cutting views of the atlas: demographics, communities, similarity.

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Interrogate the atlas directly

Use the Historian for natural-language election questions or open the Cartographer to move from the browse layer into live map analysis.