Gamharia Kalan is a village in Adapur tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Gamharia Kalan was 6,059 which includes 3,410 males and 2,649 females. Gamharia Kalan covers 446 ha area. Pincode of Gamharia Kalan is N/A.