Sarsi Istamrar is a village in Dhamdaha tehsil in district of Purnia, Bihar, India. As per the data provided by Census of India in 2011, total population of Sarsi Istamrar was 5,767 which includes 3,055 males and 2,712 females. Sarsi Istamrar covers 860 ha area. Pincode of Sarsi Istamrar is 854301.