Thahar Basarhia is a village in Rosera tehsil in district of Samastipur, Bihar, India. As per the data provided by Census of India in 2011, total population of Thahar Basarhia was 9,217 which includes 4,921 males and 4,296 females. Thahar Basarhia covers 303.61 ha area. Pincode of Thahar Basarhia is N/A.