Thiruvarur is a part of the Nagapattinam (Lok Sabha constituency) - it has the following six assembly constituencies - Thiruvarur, Nagapattinam, Thiruthuraipoondi, Vedaranyam, Kilvelur (SC) and Nannilam.
Law and order in the town in maintained by the Thiruvarur sub division of the Tamil Nadu Police headed by a Deputy Superintendent.