- Nagaon District: 1833
- Lakhimpur District: 1838
- Sivasagar District: 1861
- Cachar District: 1874
- Dibrugarh District: 1971
- Karbi Anglong District: 1976
- Jorhat District: 1983
- Goalpara District: 1983
- Kokrajhar District: 1983
- Karimganj District: 1983
- Dhubri District: 1983
- Sonitpur District: 1983
- Barpeta District: 1983
- Darrang District: 1983
- Golaghat District: 1987
- Hailakandi District: 1989
- Morigaon District: 1989
- Bongaigaon District: 1989
- Dhemaji District: 1989
- Tinsukia District: 1989
- Kamrup Metropolitan District: 2003
- Bagsa District: 2003
- Udalguri District: 2004
- Dima Hasao District: 2010
- West Karbi Anglong District: 2015
- Hojai District: 2015
- Charaideo District: 2015
- Biswanath District: 2015
- Majuli District: 2016
- Bajali District: 2021
- Tamulpur District: 2022
In what year the Districts of Assam were formed?
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