Chak Sirai is a village in Ujiarpur tehsil in district of Samastipur, Bihar, India. As per the data provided by Census of India in 2011, total population of Chak Sirai was 1,411 which includes 719 males and 692 females. Chak Sirai covers 96 ha area. Pincode of Chak Sirai is N/A.