<P> In the Republic of India, a chief minister is the head of government of each of twenty - nine states and two union territories (Delhi and Puducherry). According to the Constitution of India, at the state - level, the governor is de jure head, but de facto executive authority rests with the chief minister . Following elections to the state legislative assembly, the governor usually invites the party (or coalition) with a majority of seats to form the government . The governor appoints the chief minister, whose council of ministers are collectively responsible to the assembly . Given he has the assembly's confidence, the chief minister's term is usually for a maximum of five years; there are no limits to the number of terms he / she can serve . </P> <P> Since June 2018, the office of Chief Minister of Jammu and Kashmir has been vacant; Governor's rule is in force there . Of the thirty incumbents, two are women--Mamata Banerjee in West Bengal and Vasundhara Raje in Rajasthan . Serving since December 1994 (for 23 years, 259 days), Sikkim's Pawan Kumar Chamling has the longest incumbency . Amarinder Singh (b . 1942) of Punjab is the oldest chief minister while Arunachal Pradesh's Pema Khandu (b . 1979) is the youngest . Fifteen incumbents belong to the Bharatiya Janata Party and three to the Indian National Congress; no other party has more than one chief minister in office . </P> <Table> <Tr> <Th> Colour key for parties </Th> </Tr> <Tr> <Td> Aam Aadmi Party All India Anna Dravida Munnetra Kazhagam All India Trinamool Congress Bharatiya Janata Party Biju Janata Dal Communist Party of India (Marxist) Indian National Congress Janata Dal (Secular) Janata Dal (United) Nationalist Democratic Progressive Party National People's Party Sikkim Democratic Front Telangana Rashtra Samithi Telugu Desam Party N / A (Governor's rule) </Td> </Tr> </Table> <Tr> <Th> Colour key for parties </Th> </Tr>

All list of minister of india 2018 in hindi