Jan Mahammadpur is a village in Colgong tehsil in district of Bhagalpur, Bihar, India. As per the data provided by Census of India in 2011, total population of Jan Mahammadpur was 1,607 which includes 878 males and 729 females. Jan Mahammadpur covers 49 ha area. Pincode of Jan Mahammadpur is 813203.