| July 15, 1862 12 Stat. 576 |
Congress established a U.S. circuit court for the District of Iowa and assigned the district to the Ninth Circuit. |
| July 23, 1866 14 Stat. 209 |
Congress reorganized the circuits and assigned the District of Iowa to the Eighth Circuit. |
| July 20, 1882 22 Stat. 172 |
This act divided Iowa into the northern and southern judicial districts and created a U.S. circuit court for each district. |
| March 3, 1911 36 Stat. 1087 |
Congress abolished the U.S. circuit courts, effective January 1, 1912. |