I
- Idaho woman suffrage (3)
- Immigrant suffrage (4)
- Immigrant voters (1)
- Immigrants (2)
- Immigration (2)
- Index (5)
- Ingersoll, Robert (1)
- Inhabitants-statistics (1)
- Inter-urban Woman Suffrage Council (New York, New York). (5)
- International arbitration (4)
- International Council of Women (4)
- International Men's League (1)
- International Peace Congress (4)
- International Peace Movement (1)
- International Suffrage Alliance (2)
- International Woman Suffrage Alliance-Congress (6)
- International Woman Suffrage Alliance (16)
- International Woman Suffrage Conference (2)
- Interurban Woman Suffrage Council of Greater New York (3)
- Iowa-suffrage (1)
- Irvine, Alexander (1)
- Isenberg, Constantin (1)
- Ives, Martha H. (1)
- Ivins, Emma Y. (4)
- Ivins, Mrs. William M. (8)