Garhatha Kalan 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 Garhatha Kalan was 1,503 which includes 801 males and 702 females. Garhatha Kalan covers 68.3 ha area. Pincode of Garhatha Kalan is N/A.