Seydunganallur is a village in Srivaikuntam tehsil in district of Thoothukkudi, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Seydunganallur was 7,708 which includes 3,817 males and 3,891 females. Seydunganallur covers 1084.03 ha area. Pincode of Seydunganallur is 628809.