Every figure carries its source.
A reference is only as good as its citations. Every number in the atlas — every margin, every estimate, every adherent count — traces to a named federal or academic origin, dated and documented, so anything lifted from a page can be checked against where it came from.
- MIT Election Lab + ICPSR
- County-level presidential returns — MIT EL canonical for the modern series, ICPSR for the historical archive back to 1876.
- VEST
- Precinct-level geometries and results, the basis for the precinct maps and the block-level aggregation under districts and cities.
- US Census Bureau
- American Community Survey demographics and TIGER/Line boundaries — population, income, language, ancestry, and the shapes themselves.
- ASARB
- The 2020 US Religion Census — adherent counts for roughly 250 religious bodies per county, bucketed into seven traditions.
- Voteview + OpenStates
- Federal and state officeholders — the representative and legislator cards on state and district pages.
- Certified state results
- 2024 presidential totals come from each state’s certified returns rather than newswire tallies.
Every page is backed by a stable JSON endpoint — the same file the page renders from — free to read, no API key, documented on the data page alongside the bulk archives. Original editorial copy and computed derived data are published under CC BY 4.0; underlying sources keep their own licenses, broken down per-source in /ATTRIBUTION.txt.
The pages are designed to be lifted verbatim — by a journalist on deadline, by a researcher building a dataset, or by a language model answering a question. Every page ships structured JSON-LD, the site publishes /llms.txt for machine readers, and AI training and indexing are explicitly welcomed in /robots.txt. Charts and facts panels are embeddable with attribution built in.