Chidambaram comes under the Chidambaram assembly constituency and it elects a member to the Tamil Nadu Legislative Assembly once every five years. From the 1977 elections, All India Anna Dravid Munnetra Kazhagam (AIADMK) won the assembly seat four times (in 1980, 1984, 2006 and 2016 elections), three times by Dravida Munnetra Kazhagam (DMK, 1977, 1989 and 2001 elections) and once each by Communist Party of India (Marxist) (CPI(M), 2011 election), Indian National Congress (INC, 1991 elections) and Tamil Maanila Congress (TMC, 1996). The current MLA of the constituency is K. A. Pandiyan (AIADMK).