| June 16, 1906 34 Stat. 267 |
Congress organized Oklahoma as two judicial districts, the Eastern and the Western, with one judgeship each, and assigned the districts to the Eighth Circuit. The act became effective upon the admission of the State of Oklahoma on November 16, 1907. |
| September 14, 1922 42 Stat. 837 |
One temporary judgeship authorized for the Eastern District. |
| February 16, 1925 43 Stat. 945 |
The act established the Northern District of Oklahoma. It transferred the temporary judgeship authorized for the Eastern District in 1922 to the Northern District and made that position permanent. |
| February 28, 1929 45 Stat. 1346 |
Congress assigned the districts of Oklahoma to the newly-organized Tenth Circuit. |
| June 22, 1936 49 Stat. 1804 |
One judgeship authorized to serve all three districts. |
| May 24, 1940 54 Stat. 219 |
One temporary judgeship authorized for the Western District. |
| August 3, 1949 63 Stat. 493 |
Temporary judgeship authorized for the Western District in 1940 made permanent. |
| May 19, 1961 75 Stat. 80 |
One judgeship authorized to serve all three districts. |
| October 20, 1978 92 Stat. 1629 |
One additional judgeship authorized for the Northern District and one for the Western District. |
| July 10, 1984 98 Stat. 333 |
One additional judgeship authorized for the Western District. |
| December 1, 1990 104 Stat. 5089 |
One additional judgeship authorized for the Northern District, one additional for the Western District. One of the two judgeships previously authorized to serve all three districts assigned exclusively to the Western District. |