Hasanpur Kainju is a village in Tajpur tehsil in district of Samastipur, Bihar, India. As per the data provided by Census of India in 2011, total population of Hasanpur Kainju was 839 which includes 434 males and 405 females. Hasanpur Kainju covers 78 ha area. Pincode of Hasanpur Kainju is N/A.