The municipality of Sivaganga was constituted as a third grade municipality in 1965 and promoted to first grade during May 1998. As of 2008, the municipality covered an area of and had a total of 27 members. The functions of the municipality is devolved into six departments: General, Engineering, Revenue, Public Health, Town planning and the Computer Wing. All these departments are under the control of a Municipal Commissioner who is the supreme executive head. The legislative powers are vested in a body of 27 members, one each from the 27 wards. The legislative body is headed by an elected Chairperson assisted by a Deputy Chairperson. The municipality had an income of 54,631,000 and an expenditure of 75,385,000 for the year 2010–11.