Government Accountability Office (GAO)
HQ: Washington, D.C.
Other locations: Atlanta, Boston, Chicago, Dallas, Dayton, Denver, Huntsville, Los Angeles, Norfolk, Seattle, and San Francisco
Mission: To support the Congress in meeting its constitutional responsibilities and to help improve the performance and ensure the accountability of the federal government for the benefit of the American people. GAO provides Congress with timely information that is objective, fact-based, nonpartisan, nonideological, fair, and balanced.