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A-Z index of U.S. government departments and agencies

Find contact information for U.S. federal government departments and agencies including websites, emails, phone numbers, addresses, and more.



The Immigrant and Employee Rights Section is responsible for protecting immigrants authorized to work in the U.S. against employment discrimination.

The U.S. Citizenship and Immigration Services is responsible for processing immigration and naturalization applications and establishing policies regarding immigration services.

Immigration and Customs Enforcement enforces federal laws governing border control, customs, trade, and immigration.

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The mission of the Bureau of Indian Affairs is to enhance the quality of life, to promote economic opportunity, and to carry out the responsibility to protect and improve the trust assets of American Indians, Indian tribes, and Alaska Natives.

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The Indian Arts and Crafts Board enforces the Indian Arts and Crafts Act of 1990 that prohibits false advertising in the marketing of Indian arts or crafts. The Board also provides certified Indian-owned business listings, provides federally recognized tribes with business assistance, and operates several Indian Arts and Crafts museums.

The Indian Health Service provides federal health services to American Indians and Alaska Natives.

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The U.S. Indo-Pacific Command is responsible for defending and promoting U.S. interests in the Pacific and Asia.

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The Indoor Air Quality Division is part of the U.S. Environmental Protection Agency and aims to raise public awareness of information related to indoor air quality.


Indoor Air Quality

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The Eisenhower School provides military and civilian students education in strategy and resource management. It was formerly known as the Industrial College of the Armed Forces.

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The Bureau of Industry and Security promotes the nation’s economic development and technological advancement by ensuring an effective export control and treaty compliance system.

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The Council of the Inspectors General on Integrity and Efficiency address integrity, economy, and effectiveness issues in the federal government.

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The Institute of Education Sciences provides rigorous evidence on which to base educational policy and practices.

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The Institute of Museum and Library Services is a grant making organization that also conducts research and develops policy. The Institute helps libraries and museums innovate, fosters lifelong learning and cultural and civic engagement.

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The Institute of Peace promotes research, policy analysis, education, and training on international peace and conflict resolution in an effort to prevent and resolve violent conflicts, and to promote post-conflict stability.


Institute of Peace

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The Inter-American Foundation provides grant support to Latin American and Caribbean grass-roots groups and non-governmental organizations with creative self-help ideas.

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The Interagency Alternative Dispute Resolution Working Group helps federal agencies develop and implement Alternative Dispute Resolution programs.

With representatives from 16 federal agencies, this committee partners with the public and private organizations to identify and manage invasive plants in the U.S.

The Interagency Council on Homelessness works in partnership with every level of government and the private sector to reduce and end homelessness in the nation.

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The Department of the Interior manages public lands and minerals, national parks, and wildlife refuges and upholds Federal trust responsibilities to Indian tribes and Native Alaskans. Additionally, Interior is responsible for endangered species conservation and other environmental conservation efforts.

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The Internal Revenue Service (IRS) administers and enforces U.S. federal tax laws.

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The U.S. International Development Finance Corporation (DFC) is America’s development bank. DFC partners with the private sector to finance solutions to the most critical challenges facing the developing world.

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The Bureau of International Labor Affairs works to improve working conditions, raise living standards, protect workers’ ability to exercise their rights, and address the workplace exploitation of children and other vulnerable populations.

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The International Trade Administration promotes U.S. exports by providing diplomatic support, helping to shape trade policy, removing trade barriers, and enforcing U.S. trade laws and agreements.

The International Trade Commission investigates whether or not, and to what extent, an unfair trade practice harms U.S. businesses. When unfair trade practices are found to harm U.S. businesses, the Commission may implement corrective measures. The Commission also provides the President and Congress impartial information on international trade to inform trade policy.

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Interpol Washington, the U.S. National Central Bureau, coordinates law enforcement activities between U.S. agencies and their international counterparts.

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