Sirinagar is a village in Thakrahan tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Sirinagar was 10,748 which includes 5,853 males and 4,895 females. Sirinagar covers 2406 ha area. Pincode of Sirinagar is 845452.