Publisher
- Industrial Relations Office7
- Industrial Relations Office (Navy)32
- Infantry and Cavalry School7
- Infantry and Cavalry School (War Department)10
- Inferior and Insular Affairs Committee13
- Inferior and Insular Affairs Committee, Senate4
- Infernal Security Committee, House1
- Information Division85
- Information Office933
- Information Service55
- Information and Education Division121
- Information and Education Service22
- Information and Education on Division6
- Information and Publications Office8
- Information for Armed Forces, Office of30
- Inland Waterways Commission1
- Inland Waterways Corporation31
- Inland and Coastwise Waterways Service3
- Insecticide and Fungicide Board74
- Inspection Division1