List of districts of Arunachal Pradesh

History
On December 1, 1965 the erstwhile North-East Frontier Agency was divided in to five districts:
 * 1) Kameng district
 * 2) Subansiri district
 * 3) Siang district
 * 4) Lohit district
 * 5) Tirap district

On May 13, 1980, Subansiri district was bifurcated into two districts: Lower Subansiri district and Upper Subansiri district. Upper Subansiri district comprised the area occupied by the erstwhile Daporijo sub-division and Lower Subansiri district comprised the rest of the area occupied by the erstwhile Subansiri district. On June 1, 1980 the erstwhile Lohit district was divided into two districts: Lohit district and Dibang Valley district. On the same day, Siang district was bifurcated in to two districts: East Siang district and West Siang district and Sepla and Bomdila sub-divisions of the Kameng district were transformed in to East Kameng district and West Kameng district respectively.

On October 6, 1984 Tawang district was separated from East Kameng district. In 1987, the ersthwile Tirap district was divided in to two districts: Tirap district and Changlang district. On September 22, 1992 the erstwhile Lower Subansiri district was again bufurcated in to Lower Subansiri district and Papum Pare district. In June, 2000 Kurung Kumey district was carved out from the erstwhile Lower Subansiri district. On December 16, 2001 Dibang Valley district was bifurcated in to Upper Dibang Valley district and Lower Dibang Valley district. On February 16, 2004 Anjaw district was carved out from the erstwhile Lohit district.

Administrative set-up
The districts of Arunachal Pradesh state are administrative geographical units, each headed by a deputy commissioner, an officer belonging to the Indian Administrative Service.

Districts
Presently, Arunachal Pradesh state comprises 16 districts. Most of them are inhabited by various tribal groups. These are :
 * 1) Anjaw district
 * 2) Changlang district
 * 3) East Kameng district
 * 4) East Siang district
 * 5) Kurung Kumey district
 * 6) Lohit district
 * 7) Lower Dibang Valley district
 * 8) Lower Subansiri district
 * 9) Papum Pare district
 * 10) Tawang district
 * 11) Tirap district
 * 12) Upper Dibang Valley district
 * 13) Upper Subansiri district
 * 14) Upper Siang district
 * 15) West Kameng district
 * 16) West Siang district