[2] Sjernarøy consisted of several small and larger islands for a total of 37.44 square kilometres (14.46 sq mi) of land.

[3] The inhabited islands included Kyrkjøy, Bjergøy, Eriksholmen, Tjul, Nord-Hidle, Aubø, Helgøy, Nord-Talgje, and the western part of Ombo.

Another meaning could be based on the word serða which is a vulgar term for "intercourse" (many phallus-shaped stones have been found in the island group).

[7] The municipal council (Herredsstyre) of Sjernarøy was made up of 15 representatives that were elected to four year terms.

The party breakdown of the final municipal council was as follows: The mayors (Norwegian: ordfører) of Sjernarøy (incomplete list):[15]