Louisiana is a state in the southeastern region of the United States. Louisiana's the 31st in size and the 25th most populous of the 50 United States. Louisiana's capital is Baton Rouge and Louisiana's largest city is New Orleans. Louisiana's the only state in the U.S. with political subdivisions termed parishes, which are the local government's equivalent to counties. The largest parish by population is East Baton Rouge Parish, and the largest by total area is Plaquemines. There are currently 502 Louisiana airports in our database.