The following is a list of all United States Government Departments and Agencies that start with “I”:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Idaho (State of)
Illinois (State of)
Immigration and Citizenship Services (USCIS)
Immigration and Customs Enforcement (ICE) | Online Tip
Indian Affairs | Tribal Leaders Directory
Indian Arts and Crafts Board | Sioux Indian Museum | Museum of the Plains Indian | Southern Plains Indian Museum | Indian Art Markets and Events
Indian Health Service | Indian Health Service Phone Directory
Indiana (State of)
Industrial College of the Armed Forces
Industry and Security, Bureau of (BIS)
Information Resource Management College
Information Resources Center (ERIC)
Innovation and Improvement Office
Inspectors General | Report Government Waste and Fraud
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 | Find Help For The Homeless
Interior Department (DOI)
Internal Revenue Service (IRS)
International Labor Affairs, Bureau of
International Trade Administration (ITA)
International Trade Commission
Interpol
Iowa (State of)