Eraiyur is a village in Cheyyar tehsil in district of Tiruvannamalai, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Eraiyur was 1,369 which includes 674 males and 695 females. Eraiyur covers 448.79 ha area. Pincode of Eraiyur is 604409.