Mahadevagarh is a village in Saraiyahat tehsil in district of Dumka, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Mahadevagarh was 643 which includes 313 males and 330 females. Mahadevagarh covers 223.44 ha area. Pincode of Mahadevagarh is 814151.