Ganga Sirsiya is a village in Kalyanpur tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Ganga Sirsiya was 2,647 which includes 1,399 males and 1,248 females. Ganga Sirsiya covers 162 ha area. Pincode of Ganga Sirsiya is 845426.