The District of Louisiana, or Louisiana District, was an official and temporary United States government designation for the portion of the Louisiana Purchase that had not been organized into the Territory of Orleans or "Orleans Territory" (the portion of the Louisiana Purchase south of the 33rd parallel, which is now the Arkansas–Louisiana state line). The district officially existed from March 10, 1804, until July 4, 1805, when it was incorporated as the Louisiana Territory.
The area north of present-day Arkansas was commonly referred to as Upper Louisiana. The United States District of Louisiana had two incarnations: first, as a federally administered military district (March 10, 1804 - September 30, 1804); then as an organized territory (October 1, 1804 – July 4, 1805) under the jurisdiction of the Indiana Territory.
A similarly named "Louisiana District" had also previously been an administrative division under Spanish and French rule.
In legislation enacted October 31, 1803, Congress made provisions for a temporary government of the territory purchased from France. The president was authorized to use military forces to maintain order, although the local civil government was to continue as it had under French and Spanish rule.
This military rule was in effect from March 10, 1804 —the official date of transfer from French hands (known as Three Flags Day) —until September 30, 1804. At this time, the district was further divided into five administrative divisions or districts: New Madrid, Cape Girardeau, Ste. Genevieve, St. Charles, and St. Louis.
Amos Stoddard served during this time as district commandant.
On March 26, 1804, Congress enacted legislation effective October 1, 1804, that extended the authority of the governor and judges of the Indiana Territory to provide temporary jurisdiction over the District of Louisiana.
Later that year, Indiana territorial governor William Henry Harrison and territorial judges Davis, Griffin, and Vandenberg held court in the district capital of St. Louis and enacted laws for the region.