Vellaiyur is a village in Ulundurpettai tehsil in district of Viluppuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Vellaiyur was 2,903 which includes 1,413 males and 1,490 females. Vellaiyur covers 465.32 ha area. Pincode of Vellaiyur is 606107.