Sem is a former municipality in Vestfold county, Norway. The 102-square-kilometre (39 sq mi) municipality existed from 1838 until its dissolution in 1988. The area is now part of Tønsberg Municipality. The administrative centre was the village of Semsbyen. Other villages in Sem included Barkåker, Eik, Husvik, Husøy, Ringshaug, and Tolvsrød.

Borre is a former municipality in Vestfold county, Norway. The 69-square-kilometre (27 sq mi) municipality existed from 1838 until its dissolution in 1988. Borre was merged with Horten in 1988, and the new municipality bore the name Borre until after a public referendum regarding the name in 2002. The administrative centre was the village of Borre. Other villages in Borre included Skoppum and Nykirke. After 1965, Åsgårdstrand was also part of Borre. The main churches in Borre were Borre Church and Nykirke Church.