Harnahi is a village in Kusheshwar Asthan Purbi tehsil in district of Darbhanga, Bihar, India. As per the data provided by Census of India in 2011, total population of Harnahi was 2,316 which includes 1,223 males and 1,093 females. Harnahi covers 261 ha area. Pincode of Harnahi is N/A.