Founded in 1834 by the Marigny de Mandeville family of New Orleans, the city of Mandeville developed early on as a lakeside summer resort for wealthy locals of the Crescent City. In the 1950s, Mandeville was connected to the south shore of Lake Pontchartrain via the Causeway, the longest bridge in the world. Mandeville is known as the oldest inhabited locality in St. Tammany Parish. Key historic properties can be found on Lakeshore Drive. Lake Pontchartrain, provides a great deal of pleasure for swimmers and boaters. The City of Mandeville has a wide variety of shopping areas, an excellent school system and award winning restaurants. Mandeville offers historic and new development real estate.