Kasimpur is a village in Banma Itahri tehsil in district of Saharsa, Bihar, India. As per the data provided by Census of India in 2011, total population of Kasimpur was 3,633 which includes 1,854 males and 1,779 females. Kasimpur covers 273.6 ha area. Pincode of Kasimpur is 852127.