Sonpurwa is a village in Runisaidpur tehsil in district of Sitamarhi, Bihar, India. As per the data provided by Census of India in 2011, total population of Sonpurwa was 2,092 which includes 1,069 males and 1,023 females. Sonpurwa covers 143.2 ha area. Pincode of Sonpurwa is N/A.