US Codex
A fast, accessible reading edition of federal law. Citations become live links, cross-references preview on hover, and every official release is archived so you can read any provision as it stood on any date.
What every page gives you
- Instant citation previews. Read a referenced provision without leaving the page.
- Inbound cross-references. See which other sections cite the provision you are reading.
- Version history & diffs. Read any section as it stood at an earlier release, or compare two releases directly.
- Fast search. Section numbers and headings autocomplete as you type; Enter runs a full-text search.
- Permanent links. URLs address a specific provision at a pinned release, so a shared link opens the exact text you meant.
- AI & MCP. Connect research agents through the Model Context Protocol server for search, retrieval, citation parsing and diffs.
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An independent, open project, not affiliated with the federal government. More about US Codex and where its text comes from →