Kumhargarhia is a village in Jamua tehsil in district of Giridih, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Kumhargarhia was 418 which includes 216 males and 202 females. Kumhargarhia covers 75.05 ha area. Pincode of Kumhargarhia is 815318.