Garhbainan is a village in Azamnagar tehsil in district of Katihar, Bihar, India. As per the data provided by Census of India in 2011, total population of Garhbainan was 3,042 which includes 1,564 males and 1,478 females. Garhbainan covers 565 ha area. Pincode of Garhbainan is N/A.