| June 26, 1876 19 Stat. 61 |
Congress organized Colorado as one judicial district, authorized one judgeship for the U.S. District Court, and assigned the district to the Eighth Circuit. The act became effective upon the admission of the State of Colorado on August 1, 1876. |
| February 28, 1929 45 Stat. 1346 |
Congress assigned the District of Colorado to the newly-organized Tenth Circuit. |
| February 10, 1954 68 Stat. 8 |
One additional judgeship authorized. |
| May 19, 1961 75 Stat. 80 |
One additional judgeship authorized. |
| June 2, 1970 84 Stat. 294 |
One additional judgeship authorized. |
| October 20, 1978 92 Stat. 1629 |
Two additional judgeships authorized. |
| July 10, 1984 98 Stat. 333 |
One additional judgeship authorized. |