West Baton Rouge Parish (French: Paroisse de Bâton Rouge Ouest, Spanish: Parroquia del Oeste de Baton Rouge) is one of the sixty-four parishes in the U.S. state of Louisiana. Established in 1807, its parish seat is Port Allen. With a 2020 census population of 27,199 residents, West Baton Rouge Parish is part of the Baton Rouge metropolitan statistical area.