DeSoto Parish is a parish located in the U.S. state of Louisiana. The parish was formed in 1843. At the 2020 U.S. census, the population was 26,812. Its parish seat is Mansfield. DeSoto Parish is part of the Shreveport–Bossier City metropolitan statistical area.

Mansfield is a small city in, and the parish seat of, DeSoto Parish, Louisiana, United States. Mansfield is part of the Shreveport–Bossier City metropolitan statistical area, with a 2020 population of 4,714.