Gretna is a city located in Louisiana. With a 2020 population of 17,640, it is the 19th largest city in Louisiana and the 2051st largest city in the United States. Gretna is currently declining at a rate of -0.25% annually and its population has decreased by -0.54% since the most recent census, which recorded a population of 17,736 in 2010. Gretna reached it's highest population of 24,875 in 1970. Spanning over 4 miles, Gretna has a population density of 4,371 people per square mile.
The average household income in Gretna is $66,173 with a poverty rate of 17.74%. The median rental costs in recent years comes to $888 per month, and the median house value is $174,400. The median age in Gretna is 39.5 years, 38.4 years for males, and 40.7 years for females. For every 100 females there are 101.1 males.