Gangahar Hardia is a village in Fatehpur tehsil in district of Gaya, Bihar, India. As per the data provided by Census of India in 2011, total population of Gangahar Hardia was 352 which includes 184 males and 168 females. Gangahar Hardia covers 43 ha area. Pincode of Gangahar Hardia is 824032.