# National Historical Register

> Independent guide to the US National Register of Historic Places: one page per listed property with a machine-generated summary of the official nomination document (clearly labelled, linked to the source PDF), a free-licence photo with credit, coordinates, nearby listings and practical notes for owners. National Historical Register is an independent, privately run guide. It is not affiliated with, endorsed by, or operated on behalf of the National Park Service, the US Department of the Interior, the National Register of Historic Places, or any State Historic Preservation Office.

Coverage: 36,783 listings in 10 states; 30,840 with nomination summaries; 29,443 with photos. Launching state by state.

Citing: cite the property page URL and the NRHP reference number shown on it. Summaries are model-generated from the nomination; the page links to the source document in the National Archives. Our compiled fields are CC0; photos carry their own licences.

## Pages
- Property: https://nationalhistoricalregister.com/{state}/{county}/{slug}-{nrhp_refnum}/  (e.g. https://nationalhistoricalregister.com/massachusetts/suffolk-county/old-north-church-66000776/)
- County: https://nationalhistoricalregister.com/{state}/{county}/
- State: https://nationalhistoricalregister.com/{state}/
- Historic district: https://nationalhistoricalregister.com/districts/{state}/{slug}-{nrhp_refnum}/
- Address lookup tool: https://nationalhistoricalregister.com/tools/address-lookup/
- Guides: https://nationalhistoricalregister.com/guides/

## JSON API (read-only, no key)
- https://nationalhistoricalregister.com/api/v1/listings/{nrhp_refnum}  one listing with summary fields, coordinates, photo credit, sources
- https://nationalhistoricalregister.com/api/v1/search?q={text}&state={XX}&limit=20  name/city search
- https://nationalhistoricalregister.com/api/v1/nearby?lat={lat}&lon={lon}&radius=200  listings within radius (m) and districts containing the point

## States loaded
- California: https://nationalhistoricalregister.com/california/
- Georgia: https://nationalhistoricalregister.com/georgia/
- Illinois: https://nationalhistoricalregister.com/illinois/
- Massachusetts: https://nationalhistoricalregister.com/massachusetts/
- New York: https://nationalhistoricalregister.com/new-york/
- North Carolina: https://nationalhistoricalregister.com/north-carolina/
- Ohio: https://nationalhistoricalregister.com/ohio/
- Pennsylvania: https://nationalhistoricalregister.com/pennsylvania/
- Texas: https://nationalhistoricalregister.com/texas/
- Virginia: https://nationalhistoricalregister.com/virginia/

## Policies
- https://nationalhistoricalregister.com/editorial-policy/  how summaries are generated, labelled and corrected
- https://nationalhistoricalregister.com/data-sources/  sources, refresh schedule, licences
- https://nationalhistoricalregister.com/not-affiliated/  independence statement
- Sitemap index: https://nationalhistoricalregister.com/sitemap.xml