Tamil Nadu recorded 30.62 per cent polling till 11 am.
Arani polled the highest (36.51%) while Chennai Central polled the minimum (22.89%).
Deputy chief minister O. Panneerselvam cast his vote at a polling station in Periakulam accompanied by his family members.
As many as 500 residents of Nagaraja Kandigai in Gummudipoondi has decided to boycott the elections as they are suffering from pollution from an iron factory that was closed a few years ago.
Fight between the AIADMK-led alliance which includes the BJP, PMK, and DMDK among others, and the Secular Democratic Front (SDF)-led DMK, along with the Congress, VCK, MDMK, and the Left parties.
Tamilnadu votes for 38 Parliamentary constituencies and bypolls to 18 Assembly constituencies today.