Thirunilai is a village in Chengalpattu tehsil in district of Kancheepuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thirunilai was 811 which includes 415 males and 396 females. Thirunilai covers 380.3 ha area. Pincode of Thirunilai is 603109.