He served as the Chief Minister of Sikkim for 24 years and 165 days from December 1994 to May 2019.
He held the position of Chief Minister in West Bengal for 23 years from June 1977 to November 2000.
Apang served as the Chief Minister of Arunachal Pradesh for 22 years and 8 months from January 1980 to August 1999 and then again from August 2003 to April 2007.
Sarkar served as the Chief Minister of Tripura for 20 years from March 1998 to March 2018.
Patnaik has been the Chief Minister of Odisha since March 2000 and is currently serving his fifth consecutive term, making it more than 21 years in office as of June 2023.
Patel held the position of Chief Minister in Karnataka for 19 years and 78 days from October 1996 to May 1999.
Khandu has been the Chief Minister of Arunachal Pradesh since July 2016 and is currently serving his third consecutive term, totaling over 6 years as of June 2023.
Thanhawla served as the Chief Minister of Mizoram for 18 years and 331 days from March 1984 to December 1986 and then again from December 1989 to December 2018.
Kumar has been the Chief Minister of Bihar for a total of over 16 years, serving multiple terms since November 2005, with his current term starting in November 2020.
Rangasamy has served as the Chief Minister of Puducherry for over 15 years, with his current term starting in May 2021.