Parishes in Louisiana include Orleans, East Baton Rouge, Acadia and Lafayette. Parishes are the political and geographical jurisdictions in the state of Louisiana. After the Louisiana Purchase in 1803, the Territory of Orleans was divided into 12 counties that covered approximately the same areas of the parishes, but the borders were poorly defined, so the parish names and boundaries remained intact.
Established in 1807, Orleans Parish, one of the original 19 parishes, is named after the Duke of Orleans, who was the regent of France. The city of New Orleans lies within Orleans Parish, making it the most culturally diverse parish. Before Hurricane Katrina, Orleans Parish had the highest population of residents in Louisiana. As of the 2010 United States Census, it is the third-most populous in the state.
East Baton Rouge Parish was established in 1810, and its name, meaning "red stick" in French, refers to the sticks that local Native Americans used to mark boundary lines between tribal territories. East Baton Rouge Parish is part of the Baton Rouge metropolitan area, and according to the 2010 U.S. census, is the most populous parish in Louisiana.
Acadia Parish was formed from the southwestern region of St. Landry Parish in 1886. The parish is named for Acadians, who inhabited the French colony of Acadia in Canada. Many of the Acadians were deported to France, but immigrated to Louisiana during the Great Upheaval.