Manglu Ahar is a village in Dumri tehsil in district of Giridih, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Manglu Ahar was 1,835 which includes 936 males and 899 females. Manglu Ahar covers 232 ha area. Pincode of Manglu Ahar is 825107.