Eraiyur 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 Eraiyur was 8,826 which includes 4,421 males and 4,405 females. Eraiyur covers 752.1 ha area. Pincode of Eraiyur is 607201.