Harrai Diha is a village in Nichlaul tehsil in district of Mahrajganj, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Harrai Diha was 21 which includes 13 males and 8 females. Harrai Diha covers 76.4 ha area. Pincode of Harrai Diha is 273304.