The Indian State of Karnataka consists of 31 districts grouped into 4 administrative divisions. The state geographically has 3 principal regions: the coastal region of Karavali, the hilly Malenadu region comprising the Western Ghats, and the Bayaluseeme region, comprising the plains of the Deccan plateau.
It took its present shape in 1956, when the former states of Mysore and Coorg were merged with the Kannada-speaking districts of the former states of Bombay, Hyderabad, and Madras. Unified Mysore state was made up of ten districts, Bengaluru, Kolar, Tumakuru, Mandya, Mysuru, Hassana, Chikkamagaluru , Shivamogga, Chitradurga, and Ballari which had been transferred from Madras state to Mysore in 1953, when the new state of Andhra Pradesh was created out of Madras' northern districts. Coorg State became a district known as Kodagu, Dakshina Kannada was transferred from Madras State, Uttara Kannada, Dharwad, Belagavi, and Vijayapura from Bombay State. Bidar, Kalaburagi, and Raichuru from Hyderabad State. It received its new name of Karnataka in the year 1973.
On 15 August 1986, Chief minister Ramakrishna Hegde's administration created districts of,
On 25 August 1997, Chief minister J. H. Patel's administration created districts of,
On 21 June 2007, Chief minister H. D. Kumarswamy's administration created districts of,
On 30 December 2009, Chief minister B. S. Yediyurappa's administration created district of,
On 18 November 2020, Chief minister B. S. Yediyurappa's administration created district of, 
Currently there are demands to carve out the following district,
A district of an Indian state is an administrative geographical unit, headed by a District Commissioner, an officer belonging to the Indian Administrative Service. The district commissioner is assisted by a number of officers belonging to the Karnataka Civil Service and other Karnataka state services.
A Superintendent of Police (India), usually an officer belonging to the Indian Police Service is entrusted with the responsibility of maintaining law and order and related issues of the district. He is assisted by the officers of the Karnataka Police Service and other Karnataka Police officials. Cities like Bengaluru, Mangaluru, Hubballi-Dharwad, Mysuru and Belagavi are headed by a Commissioner of Police holding the rank of Additional Director General of Police(ADGP) or Inspector General of Police (IGP).
A Deputy Conservator of Forests, an officer belonging to the Indian Forest Service is responsible for managing the forests, the environment and wildlife of the district. He is assisted by the officers of the Karnataka Forest Service and other Karnataka Forest officials and Karnataka wildlife officials.
Sect-oral development is looked after by the district head of each development department such as PWD, Health, Education, Agriculture, Animal husbandry, etc. These officers belong to the various state services.
|Kitturu Karnataka Division||Bengaluru Division||Kalyana Karnataka Division||Mysuru Division|
|Code||District||Headquarters||Established||Subdivisions(Taluka)||Population(As of 2011[update])||Area||Population density(As of 2011[update])||Map|
|BK||Bagalkot||Bagalkot||15 August 1997||1,889,752||6,575 km2 (2,539 sq mi)||288/km2 (750/sq mi)|
|BN||Bengaluru Urban||Bengaluru||1 November 1956||9,621,551||2,190 km2 (850 sq mi)||4,393/km2 (11,380/sq mi)|
|BR||Bengaluru Rural||Bengaluru||15 August 1986||990,923||2,259 km2 (872 sq mi)||431/km2 (1,120/sq mi)|
|BG||Belagavi||Belagavi||1 November 1956||4,779,661||13,415 km2 (5,180 sq mi)||356/km2 (920/sq mi)|
|BL||Ballary||Ballary||1 November 1956||1,400,970||4,252 km2 (1,642 sq mi)||290/km2 (750/sq mi)|
|BD||Bidar||Bidar||1 November 1956||1,703,300||5,448 km2 (2,103 sq mi)||313/km2 (810/sq mi)|
|BJ||Vijayapura||Vijayapura||1 November 1956||2,177,331||10,498 km2 (4,053 sq mi)||210/km2 (540/sq mi)|
|CJ||Chamarajanagar||Chamarajanagar||15 August 1997||1,020,791||5,101 km2 (1,970 sq mi)||181/km2 (470/sq mi)|
|CB||Chikkaballapura||Chikballapur||10 September 2007||1,255,104||4,524 km2 (1,747 sq mi)||296/km2 (770/sq mi)|
|CK||Chikkamagaluru||Chikkamagaluru||1 November 1956||1,137,961||7,201 km2 (2,780 sq mi)||158/km2 (410/sq mi)|
|CT||Chitradurga||Chitradurga||1 November 1956||1,659,456||8,440 km2 (3,260 sq mi)||197/km2 (510/sq mi)|
|DK||Dakshina Kannada||Mangalore||1 November 1956||2,089,649||4,560 km2 (1,760 sq mi)||430/km2 (1,100/sq mi)|
|DA||Davanagere||Davanagere||15 August 1997||1,643,494||4,460 km2 (1,720 sq mi)||370/km2 (960/sq mi)|
|DH||Dharwad||Dharwad||1 November 1956||1,847,023||4,260 km2 (1,640 sq mi)||434/km2 (1,120/sq mi)|
|GA||Gadag||Gadag||24 August 1997||1,064,570||4,656 km2 (1,798 sq mi)||229/km2 (590/sq mi)|
|GU||Kalaburagi||Gulbarga||1 November 1956||2,566,326||10,951 km2 (4,228 sq mi)||234/km2 (610/sq mi)|
|HS||Hassan||Hassan||1 November 1956||1,776,421||6,814 km2 (2,631 sq mi)||261/km2 (680/sq mi)|
|HV||Haveri||Haveri||24 August 1997||1,597,668||4,823 km2 (1,862 sq mi)||331/km2 (860/sq mi)|
|KD||Kodagu||Madikeri||1 November 1956||554,519||4,102 km2 (1,584 sq mi)||135/km2 (350/sq mi)|
|KL||Kolar||Kolar||1 November 1956||1,536,401||3,969 km2 (1,532 sq mi)||386/km2 (1,000/sq mi)|
|KP||Koppal||Koppal||24 August 1997||1,389,920||7,189 km2 (2,776 sq mi)||250/km2 (650/sq mi)|
|MA||Mandya||Mandya||1 November 1956||1,805,769||4,961 km2 (1,915 sq mi)||364/km2 (940/sq mi)|
|MY||Mysuru||Mysuru||1 November 1956||3,001,127||6,854 km2 (2,646 sq mi)||476/km2 (1,230/sq mi)|
|RA||Raichur||Raichur||1 November 1956||1,928,812||8,440 km2 (3,260 sq mi)||228/km2 (590/sq mi)|
|RM||Ramanagara||Ramanagara||10 September 2007||1,082,636||3,556 km2 (1,373 sq mi)||308/km2 (800/sq mi)|
|SH||Shimoga||Shimoga||1 November 1956||1,752,753||8,477 km2 (3,273 sq mi)||207/km2 (540/sq mi)|
|TU||Tumakuru||Tumkur||1 November 1956||2,678,980||10,597 km2 (4,092 sq mi)||253/km2 (660/sq mi)|
|UD||Udupi||Udupi||25 August 1997||1,177,361||3,880 km2 (1,500 sq mi)||329/km2 (850/sq mi)|
|UK||Uttara Kannada||Karwar||1 November 1956||1,437,169||10,291 km2 (3,973 sq mi)||140/km2 (360/sq mi)|
|VN||Vijayanagara||Hospet||18 November 2020||1,353,628||5,644 km2 (2,179 sq mi)||240/km2 (620/sq mi)|
|YD||Yadgir||Yadgir||30 December 2009||1,174,271||
5,234 km2 (2,021 sq mi)
|224/km2 (580/sq mi)|