, the Indian state Arunachal Pradesh comprised 27 districts, not including Itanagar capital complex, with more districts proposed.

  • On 1 June 1980,
  1. The erstwhile Lohit district was divided into two districts: Lohit district and Dibang Valley district.
  2. Siang district was bifurcated into two districts: East Siang district and West Siang district.
  3. Seppa and Bomdila sub-divisions of the Kameng district were transformed into East Kameng district and West Kameng district, respectively.
  • On 6 October 1984, Tawang district was separated from East Kameng district.
  • In 1987, the erstwhile Tirap district was divided into two districts: Tirap district and Changlang district.
  • On 22 September 1992, the erstwhile Lower Subansiri district was again bifurcated into Lower Subansiri district and Papum Pare district.
  • On 23 November 1994, Upper Siang district was split from East Siang district.
  • On 1 April 2001, Kurung Kumey district was carved out from the erstwhile Lower Subansiri district.
  • On 16 December 2001, Dibang Valley district was bifurcated into Dibang Valley district and Lower Dibang Valley district.
  • On 19 March 2012, Longding district was carved out from the erstwhile Tirap district.
  • On 25 November 2014, Namsai district was carved out from the erstwhile Lohit district.
  • On 7 February 2015, Kra Daadi district was carved out from the erstwhile Kurung Kumey district.
  • On 27 November 2015, a new Siang district was carved out from parts of East Siang and West Siang districts.
  • On 22 September 2017, Lower Siang district, was carved out of West Siang and East Siang districts.
  • On 4 December 2017, a new district called Kamle district was created from Lower Subansiri District and Upper Subansiri District, with its headquarters to be located in Raga. It comprises the administrative circles of Raga (which will be the district HQ), Kumporijo and Dollungmukh circles from Lower Subansiri District. The administrative circles taken from Upper Subansiri District will be Gepen Circle, Puchigeko Circle, Daporijo Sadar which falls under 25 Raga Constituency including Ligu and Liruk demarcation from Sigen Subansiri confluence in Single Administrative Unit.
  • On 30 August 2018, following 3 new districts were formed:
  1. Pakke-Kesang carved out of East Kameng district with five administrative units namely Pakke-Kessang, Seijosa, Pijiriang, Passa Valley and Dissingn Passo with district headquarters at Lemmi.
  2. Lepa-Rada created by bifurcating the Lower Siang district with headquarters at Basar and 4 administrative units namely Tirbin, Basar, Daring and Sago.
  3. Shi-Yomi created by bifurcating the West Siang district with its headquarters at Tato and 4 administrative units namely Mechuka, Tato, Pidi and Manigong.
  • On 7 February 2024, following 2 new districts were formed:
  1. Bichom