Sources
Where every number comes from
Each figure on this site traces to a public feed listed here, with its license, credit line and the date it was last fetched. The rules the code follows are on the Methods page.
Feed register
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Software in the pages
The pages draw their charts and maps with two open-source libraries, served from this site with their license files:
| Library | Version | License |
|---|---|---|
| D3Mike Bostock and contributors | 7.9.0 | ISC License |
| TopoJSONMichael Bostock | 3.0.2 | BSD 3-Clause License |
County boundaries: United States Census Bureau cartographic boundary files, 2025, simplified for the map.