Chidambaram is administered by a selective-grade municipality formed as third-grade municipality in 1873, upgraded to a second-grade in 1949, first-grade in 1974 and a selection-grade in 1998. The municipality covers an area of and also the taluk headquarters. The Chidambaram municipality has 33 wards and there is an elected councillor for each of those wards. The functions of the municipality are devolved into six departments: general administration/personnel, Engineering, Revenue, Public Health, city planning and Information Technology (IT). All these departments are under the control of a Municipal Commissioner who is the executive head. The legislative powers are vested in a body of 33 members, one each from the 33 wards. The legislative body is headed by an elected Chairperson assisted by a Deputy Chairperson.