The New Orleans metropolitan area, designated the New Orleans–Metairie metropolitan statistical area by the U.S. Office of Management and Budget, or simply Greater New Orleans, is a metropolitan statistical area designated by the United States Census Bureau encompassing seven Louisiana parishes—the equivalent of counties in other U.S. states—centered on the city of New Orleans. The population of Greater New Orleans was 1,007,275 in 2020. Greater New Orleans is the most populous metropolitan area in Louisiana, and the 45th most populous in the United States. The broader New Orleans–Metairie–Slidell combined statistical area had a population of 1,373,453 in 2020.
The New Orleans metropolitan area was devastated by Hurricane Katrina—once a category 5 hurricane, but a category 3 storm at landfall—on August 29, 2005. Within the city of New Orleans proper, multiple breaches and structural failures occurred in the system of levees and flood walls designed under federal government auspices. The city of New Orleans experienced a steep population decline after the hurricane, though by the 2020 census, it had regained a good portion of that loss.