Thandalacheri 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 Thandalacheri was 1,574 which includes 794 males and 780 females. Thandalacheri covers 265.29 ha area. Pincode of Thandalacheri is 601206.