Thumbadakkakottai is a village in Tiruvadanai tehsil in district of Ramanathapuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thumbadakkakottai was 2,601 which includes 1,300 males and 1,301 females. Thumbadakkakottai covers 1509.4 ha area. Pincode of Thumbadakkakottai is 623525.