Koir Gawan is a village in Chakia tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Koir Gawan was 2,155 which includes 1,018 males and 1,137 females. Koir Gawan covers 225.4 ha area. Pincode of Koir Gawan is 845416.