| Classification | Class D (1904–1907) Independent (1912) |
|---|---|
| Sport | Minor League Baseball |
| First season | 1904 |
| Ceased | 1912 |
| Replaced by | Central Association |
| President | Frank S. Norton (1904-1905) L.S. Peckham (1906-1907) D.M. Conroy (1912) James Williams (1912) |
| No. of teams | 15 |
| Country | United States of America |
| Most titles | 2 Ottumwa Snappers (1904–1905) |
| Related competitions | Southwest Iowa League Illinois–Indiana–Iowa League |
The Iowa State League was a minor league baseball league that played from 1904 to 1907 and in 1912. The Class D level league had franchises based in Illinois and Iowa. The Ottumwa Snappers won league championships in 1904 and 1905. The Iowa State League evolved into the Central Association.