Gretna is a city located in Jefferson Parish Louisiana. With a 2020 population of 17,515, it is the 18th largest city in Louisiana and the 2063rd largest city in the United States . Gretna is currently declining at a rate of -0.38% annually and its population has decreased by -1.25% since the most recent census, which recorded a population of 17,736 in 2010. Gretna reached it's highest population of in . Spanning over 4 miles, Gretna has a population density of 4,340 people per square mile.
The average household income in Gretna is $68,364 with a poverty rate of 17.75%. The median rental costs in recent years comes to $883 per month, and the median house value is $171,800. The median age in Gretna is 39.6 years, 38.4 years for males, and 40.9 years for females.