Gamhirgarh is a village in Thakurganj tehsil in district of Kishanganj, Bihar, India. As per the data provided by Census of India in 2011, total population of Gamhirgarh was 1,700 which includes 882 males and 818 females. Gamhirgarh covers 229.78 ha area. Pincode of Gamhirgarh is N/A.