| March 3, 1891 26 Stat. 826 | Congress established U.S. circuit courts of appeals for each of the nine judicial circuits and assigned the sitting judge of the U.S. Circuit Courts for the Ninth Circuit to sit also on the U.S. Circuit Court of Appeals for the Ninth Circuit, effective June 16, 1891. The act also authorized an additional judgeship for the Ninth Circuit’s new court. |
| February 18, 1895 28 Stat. 665 | One additional judgeship authorized for the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| April 30, 1900 31 Stat. 141 | Congress assigned the judicial district of the Territory of Hawaii to the Ninth Circuit and provided for appeals from the district court to the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| June 6, 1900 31 Stat. 321 | Congress assigned the judicial district of the Territory of Alaska to the Ninth Circuit and provided for appeals from the district court to the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| February 14, 1912 37 Stat. 1729 | Congress assigned the judicial district of Arizona to the Ninth Circuit and provided for appeals from the district court to the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| March 1, 1929 45 Stat. 1414 | One temporary judgeship authorized for the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| June 16, 1933 48 Stat. 310 | The temporary judgeship authorized by the act of March 1, 1929, 45 Stat. 1414, made permanent. |
| August 2, 1935 49 Stat. 508 | One additional judgeship authorized for the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| April 14, 1937 50 Stat. 64 | Two additional judgeships authorized for the U.S. Circuit Court of Appeals for the Ninth Circuit. |
| October 31, 1951 65 Stat. 723 | Congress assigned the judicial district of Guam to the Ninth Circuit and provided for appeals from the district court to the U.S. Court of Appeals for the Ninth Circuit. |
| February 10, 1954 68 Stat. 871 | Two additional judgeships authorized for the U.S. Court of Appeals for the Ninth Circuit. |
| June 18, 1968 82 Stat. 184 | Four additional judgeships authorized for the U.S. Court of Appeals for the Ninth Circuit. |
| November 8, 1977 91 Stat. 1265 | Congress assigned the judicial district of the Northern Mariana Islands to the Ninth Circuit and provided that the U.S. Court of Appeals for the Ninth Circuit would have jurisdiction over appeals from the highest appeals court of the Northern Mariana Islands for 15 years. |
| October 20, 1978 92 Stat. 1629 | Ten additional judgeships authorized for the U.S. Court of Appeals for the Ninth Circuit. |
| July 10, 1984 98 Stat. 333 | Five additional judgeships authorized for the U.S. Court of Appeals for the Ninth Circuit. |
| Jan. 7, 2008 121 Stat. 2534 | One additional judgeship authorized for the U.S. Circuit Court of Appeals for the Ninth Circuit, effective January 21, 2009. |
Authorized Judgeships
| 1891 | 2 |
| 1895 | 3 |
| 1929 | 4 |
| 1935 | 5 |
| 1937 | 7 |
| 1954 | 9 |
| 1968 | 13 |
| 1978 | 23 |
| 1984 | 28 |
| 2009 | 29 |