Ratanpurwa is a village in Gaunaha tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Ratanpurwa was 482 which includes 235 males and 247 females. Ratanpurwa covers 91.9 ha area. Pincode of Ratanpurwa is 845455.