Sathankulam is a panchayat town in Thoothukudi district in the Indian state of Tamil Nadu.
Sathankulam is located in the banks of the Karumeni river at . It has an average elevation of .
Total area of Sathankulam town is 5.2 km<sup>2</sup> . According to the census 2011 the town population is 22,205. population density is 4675/km<sup>2</sup>. As per the Census of 2011, Sathankulam town had 65.16% Hindus, 32.01% Christians and 2.83% Muslims.
Sattankulam assembly constituency is part of Srivaikuntam Assembly constituency & connected with Thoothukudi Lok Sabha constituency.