The municipality is unilingually Swedish-speaking with around 88.41% of the residents of Sund speaking the Swedish language as their mother tongue.

Sund was not populated by humans until the Bronze Age, however a permanent settlement was only first established in the 5th century by the Swedes.

[8] King John III of Sweden kept his deposed brother Eric XIV in captivity in the Kastelholm castle in Autumn 1571.

[citation needed] Small businesses are also abundant and the biggest employers are the municipality and the local golf course.

[9] Sund has 28 villages within its municipality: Berg, Björby, Bomarsund , Brändbolstad, Domarböle, Finby, Gesterby, Gunnarsby, Hulta, Högbolstad, Jussböle, Kastelholm; Kulla, Lappböle, Lövvik, Mångstekta, Persby, Prästgården, Rosenberg, Sibby, Smedsböle, Strömbolstad, Sundby, Svensböle, Tosarby, Tranvik, Träsk and Vivasteby.