| September 24, 1789 1 Stat. 73 |
The Judiciary Act of 1789 organized Maryland as one judicial district, authorized one judgeship for the U.S. district court, and assigned the district to the Middle Circuit. |
| February 13, 1801 2 Stat. 89 |
The Judiciary Act of 1801 established the District of Maryland, which encompassed most of the state, and the Potomac District, which included Maryland west of the Patuxent River, as well as the District of Columbia and Virginia east of the Rappahannock River. The act authorized the district judge of Maryland to preside over the court of the Potomac District, which was to sit in Alexandria, Virginia. (A later act assigned the chief judge of the Circuit Court of the District of Columbia to preside over the Potomac district court.) For the purposes of the U.S. circuit court, the act organized Maryland as a single district and assigned it to the Fourth Circuit. |
| March 8, 1802 2 Stat. 132 |
Repeal of the Judiciary Act of 1801 restored Maryland as a single judicial district, effective July 1, 1802. |
| April 29, 1802 2 Stat. 156 |
The Judiciary Act of 1802 again organized the federal courts into six circuits and assigned the District of Maryland to the Fourth Circuit. |
| February 24, 1910 36 Stat. 201 |
One temporary judgeship authorized. This position never made permanent. |
| March 3, 1927 44 Stat. 1346 |
One additional judgeship authorized. |
| May 19, 1961 75 Stat 80 |
Two additional judgeships authorized. |
| March 18, 1966 80 Stat. 75 |
One additional judgeship authorized. |
| June 2, 1970 84 Stat. 294 |
Two additional judgeships authorized. |
| October 20, 1978 92 Stat. 1629 |
Two additional judgeships authorized. |
| July 10, 1984 98 Stat. 333 |
One additional judgeship authorized. |