There are 32 districts in Tamil Nadu, each divided for revenue administration purposes into revenue divisions, which are further divided into Talukas. Each of these Talukas has a list of revenue villages and is headed by a Tahsildar. Developmental administration of the district is carried out by Panchayat Unions (or Town Panchayats) in rural areas. These panchayat unions have a set of panchayat villages under them. In urban areas, the governance is done by municipal corporations, municipalities or town panchayats based on the size of the town; each of these has a set of wards. The functions of the municipality are devolved into six departments: general administration/personnel, Engineering, Revenue, Public Health, Town Planning, and Information Technology (IT). The municipalities are administered by a Municipal Commissioner, who is the executive head. The legislative powers are vested in a body of elected members from each ward of the municipality. The legislative body is headed by an elected Chairperson assisted by a Deputy Chairperson.