Obasamudram is a village in Gummidipoondi tehsil in district of Thiruvallur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Obasamudram was 3,127 which includes 1,537 males and 1,590 females. Obasamudram covers 442.38 ha area. Pincode of Obasamudram is 601201.