Koonthalur is a village in Kodavasal tehsil in district of Thiruvarur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Koonthalur was 2,554 which includes 1,314 males and 1,240 females. Koonthalur covers 403.68 ha area. Pincode of Koonthalur is 609501.