Sillanatham is a village in Ottapidaram tehsil in district of Thoothukkudi, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Sillanatham was 1,594 which includes 795 males and 799 females. Sillanatham covers 1156.5 ha area. Pincode of Sillanatham is 628402.