Chak Mahsi is a village in Kalyanpur tehsil in district of Samastipur, Bihar, India. As per the data provided by Census of India in 2011, total population of Chak Mahsi was 6,690 which includes 3,426 males and 3,264 females. Chak Mahsi covers 457 ha area. Pincode of Chak Mahsi is N/A.