Jefferson Parish, Louisiana

Jefferson Parish
City Hall in Gretna
Location within the U.S. state of Louisiana
Louisiana's location within the U.S.
Coordinates: 29°44′N 90°06′W / 29.73°N 90.1°W / 29.73; -90.1
Country United States
State Louisiana
FoundedFebruary 11, 1825
Named afterThomas Jefferson
SeatGretna
Largest communityMetairie
Area
  Total
665 sq mi (1,720 km2)
  Land296 sq mi (770 km2)
  Water370 sq mi (1,000 km2)  56%
Population
 (2020)
  Total
440,781
  Density660/sq mi (250/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Area code504,985
Congressional districts1st, 2nd, 6th
Websitewww.jeffparish.net

Jefferson Parish (French: Paroisse 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.