Gretna is a city in Gadsden County, Florida, United States. The population was 1,709 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 1,701. It is located on U.S. 90 and is about 8 miles south of the Florida-Georgia border. Gretna apartments for rent comparison page shows most up to date rent information on Gretna apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.