The municipality of Kustavi has a building board, a social board and a culture board, each with 5 members. The council shall elect a chairman and a vice-chairman from among the members of the Board. Each member has a personal alternate.
The Audit Board has 3 members, from whom the council elects the chairman and vice-chairman of the board. The chairman and vice-chairman must be authorized. Each member has a personal alternate.
The Central Election Commission is regulated by the Election Act.
The municipality has a youth council, a council for the elderly and the disabled, and a cottage committee. The composition, establishment and operating conditions of these bodies are decided by the municipal government.