Nainijor is a village in Barhampur tehsil in district of Buxar, Bihar, India. As per the data provided by Census of India in 2011, total population of Nainijor was 25,004 which includes 13,248 males and 11,756 females. Nainijor covers 973.3 ha area. Pincode of Nainijor is 802112.