Dem Iii is a village in Pistana tehsil in district of Lower Subansiri, Arunachal Pradesh, India. As per the data provided by Census of India in 2011, total population of Dem Iii was 121 which includes 58 males and 63 females. Dem Iii covers 71.9 ha area. Pincode of Dem Iii is N/A.