Thagadi is a village in Tirukkoyilur tehsil in district of Viluppuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thagadi was 3,825 which includes 1,972 males and 1,853 females. Thagadi covers 426.28 ha area. Pincode of Thagadi is 605757.