Mandeville is a city in St. Tammany Parish, Louisiana, United States. The population was 12,421 in 2008. Mandeville is located on the North Shore of Lake Pontchartrain, along Interstate 12, across the lake from the city of New Orleans and its southshore suburbs. It is part of the New Orleans–Metairie–Kenner Metropolitan Statistical Area. Mandeville was affected by Hurricane Katrina's storm surge in August 2005 and received water and wind damage. By 2009, most of the reconstruction was completed. Mandeville was named one of the Relocate America Top 100 Places to Live in 2004, 2005, 2007, 2008, and 2009.