Thenmangalam is a village in Ulundurpettai tehsil in district of Viluppuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thenmangalam was 1,754 which includes 884 males and 870 females. Thenmangalam covers 290.69 ha area. Pincode of Thenmangalam is 607203.