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Alphabetical Agency List: I

I

L 15.1 Immigration and Naturalization Service (1933-1940)
Y 6.1 Impeachment Proceedings 
HE 20.2651 Indian Health Service (1970-1973)
HE 20.5301 Indian Health Service (1973-1983)
HE 20.9401 Indian Health Service (1983-1991)
HE 20.302 Indian Health Service (1991- )
C 57.1 Industry and Trade Administration (1977-1980)
W 111.1 Information and Education Division (1944-1947)
L 9.1 Information and Education Service (1918-1919)
I 43.1 Information Division (1938-1945)
W 101.1 Inland and Coastwise Waterways Service (1920-1923)
W 103.1 Inland Waterways Corporation (1924-1939)
C 29.1 Inland Waterways Corporation (1939-1953)
A 34.1 Insecticide and Fungicide Board (1910-1927)
D 306.1 Inspector General of Air Force (1956- )
W 9.1/1 Inspector General's Department (1874-1947)
ED 1.301 Institute of Education Sciences (1979- )
NF 4.1 Institute of Museum and Library Services (1981- )
MuS 1.2 Institute of Museum Services (1976-1981)
GS 12.1 Integrated Technology Services Office, Federal 
       Technology Service (1982-2005)

I

M 106.1 Intelligence Division (1947-1949)
T 22.1 Internal Revenue Service (1953- )
A 95.1 International Agricultural Development Series (1961-1969)
B 2.1 International Broadcasting Bureau (1994- )
AR 1.2 International Bureau of the American Republics 
ICA 1.1 International Communication Agency (1978-1982)
S 5.1 International Congresses, Conferences, and Commissions
S 17.1 International Cooperation Administration (1955- 1961)
S 6.5 International Exhibits and Expositions
P 8.1 International Postal Transport Division (1946-1970)
C 61.1 International Trade Administration (1980- )
TC 1.1 International Trade Commission (1974-1981)
W 68.1 International Waterways Commission (1902-1913)
IC 1.1 Interstate Commerce Commission (1887-1995)
W 73.1 Isthmian Canal Commission (1902-1905)