Garhia is a village in Saraigarh Bhaptiyahi tehsil in district of Supaul, Bihar, India. As per the data provided by Census of India in 2011, total population of Garhia was 3,539 which includes 1,850 males and 1,689 females. Garhia covers 475 ha area. Pincode of Garhia is 852105.