Sasthamkotta is a village in Kunnathur tehsil in district of Kollam, Kerala, India. As per the data provided by Census of India in 2011, total population of Sasthamkotta was 33,285 which includes 15,870 males and 17,415 females. Sasthamkotta covers 2442 ha area. Pincode of Sasthamkotta is 690521.