Siyandohar is a village in Thethaitangar tehsil in district of Simdega, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Siyandohar was 463 which includes 223 males and 240 females. Siyandohar covers 208 ha area. Pincode of Siyandohar is N/A.