Thrissur municipality came into existence on I st July 1942 and later in the year 2000 it was upgraded to the level of municipal corporation, by merging the adjoining Ayyanthole, Ollukkara, Koorkanchery, Ollur and Vilvattom panchayths and parts of Nadathara panchayth with the erstwhile municipal area. Thrissur municipal corporation came into being on 2 nd October 2000 with a total area of 101.42 sq km.
The Mayor (elected from among the councilors) chairs the Council meetings, and is responsible for the overall, supervision and control of the administrative functions of the Municipal Corporation. The Council is composed of all elected councilors. The administration of the Thrissur Corporation vests in the Council. The term of office of the council is five years. The Thrissur Municipal Corporation through the Council has all the powers, authority and responsibilities of the Government, to enable it to function as an institution of self government in respect of the matters entrusted to it. The Council, constitute Standing Committees for exercising its powers, discharging such duties or performing such functions, as is provided for in the Kerala Municipalities Act. The Deputy Mayor is the Chairman of the Finance Standing Committee and also presides over the Council meetings during the absence of the Mayor. The Secretary of the Thrissur Municipal Corporation is an officer appointed by the Government