Washington Parish (French: Paroisse de Washington) is a parish located in the U.S. state of Louisiana. As of the 2010 census, the population was 47,168. Its parish seat is Franklinton. The parish was founded in 1819.
Washington Parish comprises the Bogalusa, LA Micropolitan Statistical Area, which is included in the New Orleans-Metairie-Hammond, LA-MS Combined Statistical Area.