- Ice, W. T., Jr.1
- Iden, Mrs. Gay, Collector1
- Iglinsky, Mary1
- Ignico, Robert V.1
- Independent Order of Odd Fellows. Olean Lodge No. 471 (Olean, N.Y.)1
- Independent Order of St. Luke (Blacksburg, Va.)1
- Industrial Education Association for Southern Mountaineers1
- Inge, M. Thomas1
- Ingleside Book Club (Morgantown, WV)1
- Ingram, John Henry, 1842-19161
- Institute for the History of Technology and Industrial Archaeology2
- International Association for Identification1
- International News Photos (New York, N.Y.)2
- International Order of the King's Daughters and Sons. North River Circle (Gloucester County, Va.)1
- Iowa State University1