Gamharia is a Sub-District (Tehsil/Block/Mandal) in the Madhepura District of Bihar. As par Census 2011 information the sub-district code of Gamharia is 01158. There are about 13 sub-districts in Madhepura and Gamharia is one of them. Alamnagar, Bihariganj, Chausa, Ghailarh, Gwalpara, Kishanganj, Kumarkhand, Madhepura, Murliganj, Puraini, Shankarpur, Singheshwar etc. are other sub-districts in Madhepura.There are about 12 villages in Gamharia sub-district, which you can browse from villages list.