Mahthi is a village in Bibhutpur tehsil in district of Samastipur, Bihar, India. As per the data provided by Census of India in 2011, total population of Mahthi was 23,845 which includes 12,349 males and 11,496 females. Mahthi covers 1497.44 ha area. Pincode of Mahthi is 848211.