Mahnaro Istamrar is a village in Baisa tehsil in district of Purnia, Bihar, India. As per the data provided by Census of India in 2011, total population of Mahnaro Istamrar was 1,144 which includes 606 males and 538 females. Mahnaro Istamrar covers 199 ha area. Pincode of Mahnaro Istamrar is N/A.