Fatehnagar is a village in Manihari tehsil in district of Katihar, Bihar, India. As per the data provided by Census of India in 2011, total population of Fatehnagar was 8,787 which includes 4,509 males and 4,278 females. Fatehnagar covers 1125 ha area. Pincode of Fatehnagar is N/A.