Thalha Garhia is a village in Tribeniganj tehsil in district of Supaul, Bihar, India. As per the data provided by Census of India in 2011, total population of Thalha Garhia was 22,723 which includes 11,921 males and 10,802 females. Thalha Garhia covers 2450 ha area. Pincode of Thalha Garhia is N/A.