Siyum is a Sub-District (Tehsil/Block/Mandal) in the Upper Subansiri District of Arunachal Pradesh. As par Census 2011 information the sub-district code of Siyum is 01610. There are about 15 sub-districts in Upper Subansiri and Siyum is one of them. Baririjo, Chetam, Daporijo, Dumporijo, Giba, Gite Ripa, Gussar, Limeking, Maro, Nacho, Payeng, Puchi Geko, Taksing, Taliha etc. are other sub-districts in Upper Subansiri.There are about 49 villages in Siyum sub-district, which you can browse from villages list.