Terhagachh is a Sub-District (Tehsil/Block/Mandal) in the Kishanganj District of Bihar. As par Census 2011 information the sub-district code of Terhagachh is 01121. There are about 7 sub-districts in Kishanganj and Terhagachh is one of them. Bahadurganj, Dighalbank, Kishanganj, Kochadhamin, Pothia, Thakurganj etc. are other sub-districts in Kishanganj.There are about 71 villages in Terhagachh sub-district, which you can browse from villages list.