American soccer writing, history & data.
| Team | Location | Years |
|---|---|---|
| Illinois Thunder | Rockford, IL | 1990–1992 |
| Immaculate Conception | St. Louis, MO | 1908–1911 |
| Independent A.F.C. | San Francisco, CA | 1902–1912 |
| Independent A.F.C. 2nd | San Francisco, CA | 1911–1912 |
| Indian Motorcycle | Milwaukee, WI | 1920–1922 |
| Indiana Blast | Indianapolis, IN | 1997–2004 |
| Indiana Blaze | Indianapolis, IN | 1997–2001 |
| Indiana Flooring Co. F.C. | New York, NY | 1924–1927 |
| Indiana Invaders F.C. | South Bend, IN | 1998–2011 |
| Indiana Kick | Fort Wayne, IN | 1989–1990 |
| Indiana Tigers | Gary, IN | 1973–1974 |
| Indiana Twisters | Indianapolis, IN | 1997–1997 |
| Indianapolis Twisters | Indianapolis, IN | 1996–1996 |
| Indy Daredevils | Indianapolis, IN | 1978–1979 |
| Inland Empire Panteras | Redlands, CA | 1995–1995 |
| Innisfail H. & F.A. | St. Louis, MO | 1905–1907 |
| Innisfail H. & F.A. | St. Louis, MO | 1907–1908 |
| Innisfail's F.C. | St. Louis, MO | 1909–1921 |
| Inter S.C. | Queens, NY | 1960–1969 |
| Interborough Rapid Transit F.C. | New York, NY | 1919–1920 |
| International A.C. | New York, NY | 1895–1896 |
| International Club | Madison, WI | 1932–1935 |
| Irish-American A.C. | St. Louis, MO | 1911–1913 |
| Irish-Americans | Kearny, NJ | 1933–1942 |
| Irish-Americans | Kearny, NJ | 1949–1951 |
| Ironsides A.F.C. | Newark, NJ | 1916–1917 |
| I.R.T. Rangers F.C. | Bronx, NY | 1928–1930 |