Other villages in Marnardal include Bjelland, Breland, Koland, Laudal, and Øyslebø.

The official blazon is "Vert, three pine cones in pall stems conjoined Or" (Norwegian: I grønt tre gull furukongler forent i trepass).

The pine cones have a tincture of Or which means it is commonly colored yellow, but if it is made out of metal, then gold is used.

The green color in the field and the choice of pine cones on the arms symbolize the importance of the forests which cover areas of the municipality.

There are three conjoined pine cones to represent each of the three former municipalities of Bjelland, Laudal, and Øyslebø which were merged into Marnardal in 1964.

It is part of the Mandal prosti (deanery) in the Diocese of Agder og Telemark.

The municipal council (Kommunestyre) of Marnardal was made up of 21 representatives that were elected to four year terms.