Thennathur is a village in Vandavasi tehsil in district of Tiruvannamalai, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thennathur was 1,829 which includes 913 males and 916 females. Thennathur covers 603.58 ha area. Pincode of Thennathur is 604501.