Thathanur is a village in Udayarpalayam tehsil in district of Ariyalur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thathanur was 4,074 which includes 2,015 males and 2,059 females. Thathanur covers 842.05 ha area. Pincode of Thathanur is 621804.