NPS land acreage by park unit
The National Park Service's own quarterly land status report, giving federal, non-federal and total gross acreage for every unit of the National Park System, by state.
Figures
Acres
Source: National Park Service, National Park Service Land Resources Division Acreage Report. Data period June 30, 2026. Published .
Pages built on this dataset
Publisher
- Organization
- National Park Service
- Publisher’s dataset
- National Park Service Land Resources Division Acreage Report
- File or API used
- https://www.nps.gov/subjects/lwcf/upload/NPS-Acreage-06-30-2026.xlsx
- Methodology
- https://www.nps.gov/subjects/lwcf/acreagereports.htm
Coverage
- Geography
- Idaho
- Time coverage
- 2026
- Update frequency
- Quarterly
- Published
- June 30, 2026
- Retrieved
- September 15, 2026
- License of the records
- Public domain. U.S. federal government work.
- Rows
- 6 observations, 2026
Measures
| Measure | What it measures | Unit |
|---|---|---|
| National Park Service federal acres | Land the National Park Service holds by fee title or a lesser interest, by park unit. | acres |
| National Park Service unit gross acres | Total authorized area of the park unit, including land the Park Service does not itself hold. | acres |
Caveats
- Covers the three National Park Service units the report places entirely within Idaho: City of Rocks National Reserve, Craters of the Moon National Monument and Preserve, and Hagerman Fossil Beds National Monument. Minidoka National Historic Site, Nez Perce National Historical Park and Yellowstone National Park also hold Idaho land, but the report gives each one combined figure across every state it spans and attributes no share to Idaho.
- Craters of the Moon National Monument and Preserve is reported as two units, the original monument and the 2000 preserve expansion; this dataset sums them under the park's current combined name.
- Craters of the Moon is administered jointly by the National Park Service and the Bureau of Land Management. The federal acreage here is limited to what the report itself labels as the Park Service's own fee and less-than-fee acreage; the report separately lists 273,488 acres of "other federal" fee land inside the preserve's boundary, which this dataset excludes because the report does not name the agency that holds it.
- Gross acres is the unit's total authorized area, including land other than the Park Service's own holdings, such as the other-federal acreage inside Craters of the Moon National Preserve's boundary and any state, local or private inholdings; it is larger than the federal acres figure for that reason.
Where sources disagree
- National Park Service federal acres, Idaho, 2026-06-30: Congressional Research Service, Federal Land Ownership: Overview and Data, report R42346 publishes 511,963 acres. CRS reports 511,963 acres of National Park Service land in Idaho as of September 30, 2018, sourced from the Park Service's own submission for the whole state. Summing this dataset's federal acres across its three Idaho units for the quarter ending June 30, 2026 gives 479,123.22 acres. The two figures are eight years apart, and this dataset's total excludes any Idaho share of Minidoka National Historic Site, Nez Perce National Historical Park and Yellowstone National Park, which the state-level CRS figure includes; both are kept.
How to cite
Understand Idaho, “National Park Service Land Resources Division Acreage Report”, compiled from National Park Service, National Park Service Land Resources Division Acreage Report. Retrieved September 15, 2026. https://understandidaho.com/data/nps-acreage/.
Cite National Park Service directly for the figures themselves.
This page was last updated .