Ahir Ganwa is a village in Harsidhi tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Ahir Ganwa was 1,428 which includes 780 males and 648 females. Ahir Ganwa covers 140.93 ha area. Pincode of Ahir Ganwa is 845437.