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. Get contact information for each state and territory.
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- Immigrant and Employee Rights Section (IER)
- Immigration and Citizenship Services (USCIS)
- Immigration and Customs Enforcement (ICE)
- Indian Affairs
- Indian Arts and Crafts Board
- Indian Health Service
- Indo-Pacific Command
- Indoor Air Quality (IAQ)
- Industrial College of the Armed Forces
- Industry and Security, Bureau of (BIS)
- Inspectors General
- Institute of Education Sciences
- Institute of Museum and Library Services
- Institute of Peace
- Inter-American Foundation
- Interagency Alternative Dispute Resolution Working Group
- Interagency Committee for the Management of Noxious and Exotic Weeds
- Interagency Council on Homelessness
- Interior Department (DOI)
- Internal Revenue Service (IRS)
- International Development Finance Corporation (DFC)
- International Labor Affairs, Bureau of
- International Trade Administration (ITA)
- International Trade Commission
- Interpol
