Sources and rights

Every reused fact has an address.

Retrieved 2026-11-06. Remote HTML was reduced to plain text before it was stored. No API key is embedded in the site.

• National Park System list — last updated text on the page: October 26, 2026. Count used here: 64.
• Acreage reports index — workbook September 30, 2026.
• Park anniversaries table.
• Visitor use statistics definitions and the visitor use statistics dashboard.
• Monthly recreation visits, 2016–2025, from the IRMA visitation service at irmaservices.nps.gov.
• National Park Service disclaimer, including the statement that employee-created works are generally public domain unless marked otherwise, and that the arrowhead is not free to reuse.
• Chiricahua FAQ. Sentence used: Congress redesignated Chiricahua through H.R.6380, the Chiricahua National Park Act, which was signed into law on September 30, 2026.
• Boundary centroids from the NPS Land Resources Division feature service. Points are NPS Land Resources Division boundary centroids in WGS 84, not entrances, visitor centers, or trailheads.
• Coastlines: Natural Earth 1:110,000,000 cultural vectors, public domain, plus 1:50,000,000 country polygons for American Samoa and the U.S. Virgin Islands. States and coasts at 1:110,000,000. American Samoa and the U.S. Virgin Islands insets use 1:50,000,000 country polygons because the 1:110,000,000 set does not draw those islands.

Photographs

An image is included only when the NPGallery asset record says public domain, granting rights are full, and the credit names NPS or the National Park Service, without a courtesy line, a copyright symbol, or a reservation of rights. Scenic wording was preferred. Parks without a qualifying frame have no photograph.

• Acadia National Park — NPS Photo / Kaitlyn Chen. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 8b957d1b13be4154…
• Chiricahua National Park — National Park Service. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 30e486fe6ee6597c…
• Denali National Park — NPS Photo / Tim Rains. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 81e56e83283eea90…
• Glacier National Park — NPS / Tim Rains. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 8fd6f306a130a542…
• Grand Canyon National Park — NPS Photo by Michael Quinn. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 adb3057030094671…
• Great Smoky Mountains National Park — NPS Photo. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 c74e460484dd33cd…
• Hawai'i Volcanoes National Park — NPS Photo/J.P. Eaton. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 737b06865212ba3d…
• Hot Springs National Park — NPS, 2010. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 a0d5c6ca4c5e1a23…
• Indiana Dunes National Park — Katrina George - NPS. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 67cc9d4e33f2388e…
• Joshua Tree National Park — NPS / Hannah Schwalbe. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 7670139c8a69131c…
• Mammoth Cave National Park — NPS Photo. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 92013f12d2144da8…
• New River Gorge National Park and Preserve — NPS photo/Dave Bieri. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 9facd0ec3585aa4d…
• Olympic National Park — NPS photo. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 b2ff6284fd3c9d11…
• Rocky Mountain National Park — NPS/Meg Frisbie, 2012. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 7560418fc42fce97…
• Virgin Islands National Park — NPS Photo Christy McManus. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 fe56a3c5500abad3…
• Yellowstone National Park — NPS/Diane Renkin. Constraint: Public domain, Full. NPGallery asset. Retrieved 2026-11-06. SHA-256 97397e002abedfaf…

Type

Fraunces (Undercase Type) and Source Sans 3 (Adobe) are used under the SIL Open Font License. License files ship in the site’s font folder. They are not public-domain images; the license is preserved.

What was left out

The developer API that requires a key is not used. State tourism copy, university text, Wikimedia files, and stock photographs are not used. Web Mercator area from the boundary service is not treated as acreage. Preliminary 2026 visitation is not charted.