Eraiyur is a village in Chengam tehsil in district of Tiruvannamalai, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Eraiyur was 4,089 which includes 2,077 males and 2,012 females. Eraiyur covers 725.51 ha area. Pincode of Eraiyur is 606704.