Biloxi Parish was a parish (county) of the Territory of Orleans, formed in 1811 from the formerly Spanish West Florida colony. It was eliminated in 1812, the same year that Louisiana became a U.S. state, when the Gulf of Mexico coastal lands (between the Pearl River and the Perdido River) were transferred to the Mississippi Territory. It was a U.S. territorial jurisdiction which existed for approximately one year. It was located in the area which is today the coastal part of the state of Mississippi.

v t e Parishes of Louisiana
Current	Acadia Allen Ascension Assumption Avoyelles Beauregard Bienville Bossier Caddo Calcasieu Caldwell Cameron Catahoula Claiborne Concordia DeSoto East Baton Rouge East Carroll East Feliciana Evangeline Franklin Grant Iberia Iberville Jackson Jefferson Jefferson Davis LaSalle Lafayette Lafourche Lincoln Livingston Madison Morehouse Natchitoches Orleans Ouachita Plaquemines Pointe Coupee Rapides Red River Richland Sabine St. Bernard St. Charles St. Helena St. James St. John the Baptist St. Landry St. Martin St. Mary St. Tammany Tangipahoa Tensas Terrebonne Union Vermilion Vernon Washington Webster West Baton Rouge West Carroll West Feliciana Winn
Former	Counties Acadia Attakapas Biloxi Concordia German Coast Iberville LaFourche Natchitoches Opelousas Orleans Ouachita Pascagoula Pointe Coupée Rapides Warren Split Carroll Feliciana