Karnataka state comprises 29 districts, grouped into four divisions.
Karnataka took its present shape in 1956, when the states of Mysore and Coorg were merged with the Kannada-speaking districts of the former states of Bombay and Hyderabad, and Madras. Mysore state was made up of ten districts, Bangalore, Kolar, Tumkur, Mandya, Mysore, Hassan, Chikmagalur, Shimoga and Chitradurga; Bellary had been transferred from Madras state to Mysore in 1953, when the new state of Andhra Pradesh was created out of Madras northern districts. Kodagu became a district, and Dakshina Kannada district was transferred from Madras state, North Kanara, Dharwad District, Belgaum District, and Bijapur District from Bombay state, and Bidar, Gulbarga District, and Raichur district from Hyderabad state.
In 1989, Bangalore Rural district was split from Bangalore. and in 1997 Bagalkot district split from Bijapur, Chamrajnagar district split from Mysore, Gadag district split from Dharwad, Haveri district split from Dharwad, Koppal district split from Raichur, Udupi district split from Dakshina Kannada, and Davanagere district was created from parts of Bellary, Chitradurga, Dharwad, and Shimoga.
On June 21, 2007 the Government announced the cabinet approval for the creation of two more districts: Ramanagara District and Chikballapur district. Ramanagara District and Chikballapura District are being formed by the bifurcation of Bangalore Rural District and Kolar Districts respectively. The new districts have been officially notified by the Karnataka Government, thereby making the number of districts in Karnataka to 29.