Ratanpurwa is a village in Sidhaw tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Ratanpurwa was 1,482 which includes 777 males and 705 females. Ratanpurwa covers 162.3 ha area. Pincode of Ratanpurwa is N/A.