Manages public lands, national parks, and the federal government’s relationship with Tribal nations.
Interior oversees national parks, wildlife refuges, water and mineral resources, offshore energy leasing, and federal responsibilities toward Tribal nations. Most visitors know it through the National Park Service, but that’s one bureau among several with very different missions.
The National Park Service preserves unimpaired the natural and cultural resources of the National Park System for the enjoyment of this and future generations.
National Park Service mission statement
What It Does
Interior was created in 1849 as a catch-all for domestic responsibilities that didn’t fit anywhere else in the young federal government — a history that still shows in how broad its portfolio is today, spanning public lands, natural resources, and Tribal affairs in a way most other Cabinet departments don’t combine.
Manages public lands
Oversees national parks, wildlife refuges, and hundreds of millions of acres of federal land.
Oversees natural resources
Manages water rights, mineral leasing, and offshore energy development on federal land and waters.
Administers Tribal affairs
The Bureau of Indian Affairs manages the federal government’s trust and treaty responsibilities to Tribal nations.
Runs scientific programs
The U.S. Geological Survey conducts mapping, hazard monitoring, and natural-science research.
How It Fits Into Government
A department built from leftover responsibilities
The Secretary of the Interior reports to the President and leads a department that was deliberately broad from its founding — it absorbed land, patent, and pension functions that didn’t belong to any existing department in 1849. Congress writes the public-land, mining, and Tribal-trust statutes Interior administers, and funds the department through annual appropriations. Interior’s Tribal-trust responsibilities are legally distinct from its land-management role, governed by treaty obligations rather than ordinary agency discretion.
Major Bureaus
National Park Service
Manages national parks, monuments, and historic sites — the bureau most visitors actually encounter.
- Park operations
- Recreation permits
- Historic preservation
Bureau of Land Management
Manages the largest share of federal public land, including grazing, mining, and recreation permits.
- Land-use planning
- Grazing permits
- Mineral leasing
U.S. Fish and Wildlife Service
Manages wildlife refuges and enforces the Endangered Species Act.
- Wildlife refuges
- Endangered species
- Migratory bird treaties
How It Is Checked
Congress
Writes public-land, mining, and Tribal-trust statutes, and funds Interior’s budget through appropriations.
Courts
Review land-management decisions and can enforce Tribal treaty obligations against the department.
Public process
Land-use plans and environmental reviews generally go through public comment before final adoption.
Inspector General
The Interior OIG audits programs and investigates waste, fraud, and misconduct across its bureaus.
Public Services Visitors May Need
Check USGS maps or hazard dataTopographic maps, earthquake and flood monitoring.→
Look up federal land recordsLand patents, mineral rights, and survey records.→
Find Tribal program resourcesBureau of Indian Affairs services and contacts.→
Interior doesn’t own the land it manages
A common misconception is that federal public land belongs to the Department of the Interior itself. It doesn’t — Interior’s bureaus administer land held in trust for the American public (or, for Tribal trust land, for specific Tribal nations), under statutes that constrain how that land can be used, sold, or leased. The department manages the land; it doesn’t own it in any private sense, and can’t dispose of it outside the specific authority Congress has granted for that purpose.
