Katholumar is a village in Simri Bakhtiarpur tehsil in district of Saharsa, Bihar, India. As per the data provided by Census of India in 2011, total population of Katholumar was 6,621 which includes 3,589 males and 3,032 females. Katholumar covers 1018 ha area. Pincode of Katholumar is 852106.