Thennilai is a village in Kadavur tehsil in district of Karur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thennilai was 4,323 which includes 2,172 males and 2,151 females. Thennilai covers 2002.99 ha area. Pincode of Thennilai is 621301.