Chak Donai is a village in Runisaidpur tehsil in district of Sitamarhi, Bihar, India. As per the data provided by Census of India in 2011, total population of Chak Donai was 1,786 which includes 986 males and 800 females. Chak Donai covers 64.3 ha area. Pincode of Chak Donai is N/A.