Damdarsai is a village in Majhgaon tehsil in district of Pashchimi Singhbhum, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Damdarsai was 616 which includes 315 males and 301 females. Damdarsai covers 177 ha area. Pincode of Damdarsai is 833214.