- Insular Affairs Committee84
- Insular Affairs Committee, House113
- Insular Reorganization Joint Commission1
- Intelligence, Select Committee on, House3
- Interior Department and Forestry Service, Joint Committee to Investigate19
- Interior and Insular Affairs Committee, House77
- Interior and Insular Affairs Committee, Senate177
- Internal Revenue Bureau, Select Committee on Investigation of7
- Internal Revenue Taxation Joint Committee44
- International Relations Committee, House33
- Interoceanic Canals Committee25
- Interoceanic Canals Committee, Senate64
- Interstate Commerce Committee295
- Interstate Commerce Committee, Senate562
- Interstate Commerce Joint Subcommittee10
- Interstate Migration of Destitute Citizens, Select Committee to Investigate, House8
- Interstate and Foreign Commerce Committee1,761
- Interstate and Foreign Commerce Committee, House2,164
- Interstate and Foreign Commerce Committee, Senate231
- Invalid Pensions Committee255