| July 3, 1890 26 Stat. 215 |
Congress organized Idaho as one judicial district, authorized one judgeship for the U.S. District Court, and assigned the district to the Ninth Circuit. |
| June 25, 1948 62 Stat. 895 |
Congress transferred the portions of Yellowstone National Park situated in Idaho and Montana to the District of Wyoming. |
| February 10, 1954 68 Stat. 8 |
One additional judgeship authorized. |