Mangrahtia is a village in Harlakhi tehsil in district of Madhubani, Bihar, India. As per the data provided by Census of India in 2011, total population of Mangrahtia was 2,839 which includes 1,490 males and 1,349 females. Mangrahtia covers 286.1 ha area. Pincode of Mangrahtia is 847308.