Terrytown is an unincorporated community and census-designated place (CDP) in Jefferson Parish, Louisiana, United States. It is on the "Westbank" of the Mississippi River. It is a suburb within the New Orleans–Metairie–Kenner metropolitan statistical area. The population was 23,319 at the 2010 census, and 25,278 in 2020.

Jefferson Parish 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.