Onamakulam 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 Onamakulam was 1,750 which includes 859 males and 891 females. Onamakulam covers 1170.6 ha area. Pincode of Onamakulam is 628714.