As per 2001 census, the Lower Subansiri District has recorded a population 0f 98,244 comprising 49,542 males and 48,702 females of which 85,860(43,062 males (+) 42,798 females) are rural population spread over 595 villages and 12384(6480 males (+) 5,904 females) are Urban population. The average size of population of CD Block is found to be 8,256. The District population accounts for 9.62 percent of total population of the state. The average density of population per sq.km.is 10 for the district as compared to 10 persons for Arunachal Pradesh.

Lower Subansiri District ranks eight in population size and third in area (Approx. 10,135 sq.km.) among all the thirteen district of Arunachal Pradesh. Out of 3 (nine) CD Blocks, Ziro-II CD Block stands highest in rural population followed by Nyapin and Ziro-I CD Blocks.

As per 1991 Census, the literate persons and percentage to the total population of the district (excluding children in the age-group (0-6) has been recorded as 20,162(30.07%). The rural literates and percentage of the district constitutes 15,489 and 25.88. Out of which 10,135 (33.53%) are males and 5.354 (18.07%) are females. Urban population constitutes 4,673 literates,the percentage being 64.99 to total urban population. Out of which 3052 (71.98%) are males and 1,621 (54.95%) are females.

The literacy rate of the district (Rural+Urban) has increased from 11.63 percent in 1981 to 30.07 percent in 1991 census (excluding 0-6 years of age group).

So far as CD Block-wise literacy rate is concerned, Ziro-I ranks first in literacy rate (43.40%) followed by Ziro-II (34.69%) and Tamen-Raga CD Block (32.62) respectively. The lowest literacy rate is found to be in Tali CD Block with 6.43 percent.

Decadal variation of population of the district is found to be (+) 14.06 percent during the last decade (1981-91). While looking at the block level figures of decadal variation, it is observed that percentage of decadal variation is found to be highest (+) 49.93 in the Ziro-II DC Block for the rural population followed by Tamen-Raga (+)27.74 and Chambang (+) 21.81 CD Blocks. The Palin CD Block constitutes very negligible (1.52%) during the decade. It is also noticed that Ziro-I,Tali and Koloriang-Sarli CD Blocks has the negative growth rate i.e.(-) 36.43,(-) 16.66 and (-) 0.69 percent respectively. The reason is possibly due to declaration of Ziro HQ as Census Town in 1991, shifting of population to some other circle of the district and some other district of the state.

The sex ratio of the district indicates 957 females per 1000 males as compared to 859 females per 1000 males for Arunachal Pradesh. It is noticed that the sex ratio for rural areas of the district constitutes 985 females per 1000 males and sex ratio of Urban area of the district has recorded 751 females per 1000 males. Out of 9(nine) CD Blocks,Chambang CD Block ranks first in respect of sex ratio (1042 females per 1000 males) followed by Nyapin CD Block (1030 females per 1000 males and Ziro-I CD Block (1025 females per 1000 males) respectively. The lowest being found in Ziro-II and Damin CD Block (949 females per 1000 males) each.

Scheduled caste population in the district is found to be very negligible as there is no indigenous scheduled caste population in the district as well as state. Out of 595 villages in the district only 9 villages, totaling 72 persons are having scheduled caste population,the percentage being 0.10 to total rural population as against 0.08 percent in 1981 census. The Ziro Town has recorded only 61 persons scheduled caste population, the percentage being 0.69 to total urban population. The district scheduled caste population constitutes 0.16 percent as compared to 0.47 percent for Arunachal Pradesh. They are either government employees or migrated from other state for contractor’s construction works or business men.

As per 1991 Census, it is revealed that all the 595 villages and lone-Ziro Town of the district are inhabited by the scheduled Tribes population constituting 74,543 (89.63%) the total population of which 36,733 (44.17%) are males and 37,810 (45.46%) are females as compared to 63.66 percent for Arunachal Pradesh.

Total schedule Tribe population to total rural population has recorded 88,512 persons (43,491 males(+) 45,021 females), the percentage being 93.90% males and 96.09% females) as against 92.98 percent in 1981 census. Total scheduled tribe population to total Urban population constitutes 4,770 (2380 males and 2390 females), the percentage being 53.83 (47.04 males and 62.86% females).

The total workers in the district constitutes 41.682 persons (22.616 males and 19,066 females), the percentage being 50.15 (53.21 males and 46.89 females as against 57.62 percent in 1981 census. While 49.55 percent (41,205 persons) being the main workers and 0.57 percent (477 persons marginal workers as against 55.09 and 2.53 percent respectively in 1981 census. The main workers to total rural population constitutes 51.31 percent, the male being 53.14 percent and female 49.46 percent and marginal workers recorded 0.56 percent, the males being 0.22 percent and females 0.91 percent. The main workers to the total urban population indicates 34.71 percent, the males being 51.28 percent and females 12.65 percent and marginal workers 0.65 percent, the males being 0.87 percent and females 0.37 percent. The lowest percentage of main workers and total workers is found in Ziro-I CD Block, the percentage being 42.48% and 43.34% respectively.

The district Headquarter Ziro was declared as Urban during 1991 Census and rest area are still considered as rural.