I
| Senator | Years | State | Party |
|---|---|---|---|
| John James Ingalls | 1873–1891 | Kansas | Republican |
| John Irby | 1891–1897 | South Carolina | Democratic |
| James Iredell, Jr. | 1828–1831 | North Carolina | Democratic |
| Alfred Iverson, Sr. | 1855–1861 | Georgia | Democratic |
| Irving Ives | 1947–1959 | New York | Republican |
| Ralph Izard | 1789–1795 | South Carolina | Federalist |
Read more about this topic: List Of Former United States Senators