Main Interior Building
|Formed||March 3, 1849|
|Headquarters||Main Interior Building|
1849 C Street NW
Washington, D.C., U.S.
|Annual budget||$20.7 billion (2013)|
The United States Department of the Interior (DOI) is a Cabinet department of the United States government that manages and conserves most federally owned land. These responsibilities are different from other countries' Interior Departments or ministries, which tend to focus on police or security.