Jefferson Parish is a parish in Louisiana that includes most of the suburbanNew Orleans. The seat of parish government is Gretna.According to the 2000 census, Jefferson had a population of 455,466. The Greater New Orleans area, which includes both Jefferson and Orleans parishes, is the largest metropolitan area in the state. Jefferson Parish was affected by Hurricane Katrina in 2005 but has rebounded at a more rapid pace than neighboring Orleans Parish, probably because the destruction was not as severe in Jefferson. A population estimate conducted from June - October 2006 by the Louisiana Recovery Authority put Jefferson at 440,000 residents or 98% of its 2000 total, making it the largest parish in the state.
See more at Wikipedia.org...