Jefferson Parish (French: Paroisse de Jefferson; Spanish: Parroquia de Jefferson) is a parish in the U.S. state of Louisiana. As of the 2020 census, the population was 440,781. Its parish seat is Gretna, its largest community is Metairie, and its largest incorporated city is Kenner. Jefferson Parish is included in the Greater New Orleans area. According to the U.S. Census Bureau, the parish has a total area of 665 square miles (1,720 km2), of which 296 square miles (770 km2) is land and 370 square miles (960 km2) (56%) is water. More information...
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