Roska Koskagarh is a village in Krityanand Nagar tehsil in district of Purnia, Bihar, India. As per the data provided by Census of India in 2011, total population of Roska Koskagarh was 1,731 which includes 871 males and 860 females. Roska Koskagarh covers 124 ha area. Pincode of Roska Koskagarh is N/A.