Concordia Parish is a parish that borders the Mississippi River in eastern central Louisiana. As of the 2020 census, the population was 18,687. The parish seat is Vidalia. The parish was formed in 1807. Concordia Parish is part of the Natchez, MS–LA Micropolitan Statistical Area. It is historically considered part of the Natchez District, devoted to cotton cultivation as a commodity crop, in contrast to the sugar cane crop of southern Louisiana.