Semangalam is a village in Sirkali tehsil in district of Nagapattinam, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Semangalam was 2,504 which includes 1,287 males and 1,217 females. Semangalam covers 598.65 ha area. Pincode of Semangalam is 609118.