Nagapattinam is a part of the Nagapattinam (Lok Sabha constituency) — it has the following six assembly constituencies — Thiruvarur, Nagapattinam, Thiruthuraipoondi, Vedaranyam, Kilvelur (SC) and Nannilam. The current Member of Parliament from the constituency is Dr. K. Gopal from the AIADMK party. From 1957, the Nagapattinam parliament seat was held by the Indian National Congress for five times during 1957–1961, 1962–67, 1967–71, 1991–96, and 1996–98 elections. CPI won the seat for five times during 1971–77, 1977–80, 1989–91, 1996–98 and 1998 elections. DMK won four times during 1980–84, 1999–2004, 2004–09 and 2009 elections. AIADMK won the seat twice during the 1984–89 elections and 2014 elections.