Gretna is located in the parish of Jefferson. It covers a total area of 10.0 sq. km. The economy of the city revolves around industries involved in advertising, aviation, architecture, automotive, apparel, pharmaceuticals, freight forwarding, health, insurance, real estate, scrap metal and sporting goods, contribute to the local economy in a positive way. Commercial spaces are utilized by restaurants, road side services, seafood restaurants, facilities for screen printing, truck repairing facilities and variety stores, contribute to the economic development of the inhabitants of the city.