Kusmhi 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 Kusmhi was 3,413 which includes 1,772 males and 1,641 females. Kusmhi covers 242.48 ha area. Pincode of Kusmhi is 852127.