Louisiana is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north and Mississippi to the east. Of the 50 U.S. states, it ranks 20th in land area and the 25th in population, with roughly 4.6 million residents. Reflecting its French heritage, Louisiana is the only U.S. state with political subdivisions termed parishes, which are equivalent to counties, making it one of only two U.S. states not subdivided into counties. Baton Rouge is the state's capital, and New Orleans, a French Louisiana region, is its largest city with a population of about 383,000 people. Louisiana has a coastline with the Gulf of Mexico to the south; a large part of its eastern boundary is demarcated by the Mississippi River.

The West South Central states, colloquially known as the South Central states, is a region of the United States defined by the U.S. Census Bureau as covering four states: Arkansas, Louisiana, Oklahoma, and Texas. The West South Central or South Central region is located within the Southern United States and Gulf Coast regions, bordering the Mountain states and Midwestern U.S. regions to its north and west. The Gulf of Mexico is to the south of the region. Houston is the South Central's largest city, and the Dallas–Fort Worth–Arlington metropolitan statistical area is the region's largest metropolis.