Ratanpurwa is a village in Bagaha tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Ratanpurwa was 486 which includes 253 males and 233 females. Ratanpurwa covers 92.6 ha area. Pincode of Ratanpurwa is N/A.