Mahtobahiar is a village in Madhupur tehsil in district of Deoghar, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Mahtobahiar was 130 which includes 75 males and 55 females. Mahtobahiar covers 39 ha area. Pincode of Mahtobahiar is 814152.