Garaia Gachh is a village in Amour tehsil in district of Purnia, Bihar, India. As per the data provided by Census of India in 2011, total population of Garaia Gachh was 1,643 which includes 813 males and 830 females. Garaia Gachh covers 51 ha area. Pincode of Garaia Gachh is N/A.