Marnardal was established as a new municipality on 1 January 1964 through the merger of several municipalities. These areas that became Marnardal included all Bjelland municipality except for the Midtbø and Ågedal areas (population: 535), all of the municipality of Laudal, the Kleveland bru area of Finsland (population: 34), and all of Øyslebø municipality except for the Brunvatne area (population: 1,068).
