Thathampettai is a village in Chidambaram tehsil in district of Cuddalore, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thathampettai was 901 which includes 451 males and 450 females. Thathampettai covers 80.29 ha area. Pincode of Thathampettai is 608602.