Sai Nathpur is a village in Harraiya tehsil in district of Basti, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Sai Nathpur was 302 which includes 149 males and 153 females. Sai Nathpur covers 35.08 ha area. Pincode of Sai Nathpur is 272128.