Chalmette is a census-designated place (CDP) in and the parish seat of St. Bernard Parish, in southeast Louisiana, United States. The 2010 census reported that Chalmette had 16,751 people. The 2011 population is listed as 17,119; however, the pre-Katrina population was 32,069 at the 2000 census. The population hence declined by 46 etween 2000 and 2010. Chalmette is part of the New Orleans–Metairie–Kenner Metropolitan Statistical Area. Chalmette is located east of downtown New Orleans and south of Arabi, Louisiana, towards Lake Borgne.