Establishment  -  Governor  -  Chief Minister  -  Legislature (seats) 1967 - 07-18 †  -  Surjith Singh Barnala  -  M Karunanidhi  -  Unicameral (235) Official language(s) Tamil Abbreviation (ISO) IN-TN Website : tn.gov.in Seal of Tamil Nadu † Established in 1773, renamed Tamil Nadu on July eighteenth 1967 [1] Tamil Nadu pronunciation