The parish was formed in 1843 from the western portion of Claiborne Parish.
The principal city is Bossier City, which is located east of the Red River and across from the larger city of Shreveport, the seat of Caddo Parish. At the 2020 census, the population was 128,746. Bossier Parish ( / ˈ b oʊ ʒ ər/ BOH-zhər French: Paroisse de Bossier) is a parish located in the northwestern part of the U.S.