List of Australian heads of government by time in office Historical premiers Historical premiers

| Rank_ | State_ | Premier_ | Party_ | Assumed_office_ | Left_office_ | TOTAL_Time_in_office_ |
|---|---|---|---|---|---|---|
| 33. | VIC | Jeff Kennett (1948– ) AC | Liberal Party of Australia | 6 October 1992 | 20 October 1999 | 7years, 14days |
| 34. | NSW | Sir Charles Cowper (1807-1875) KCMG | Liberalism | 26 August 1856 | 2 October 1856 | 6 years, 352 days |
| 34. | NSW | Sir Charles Cowper (1807-1875) KCMG | Liberalism | 7 September 1857 | 26 October 1859 | 6 years, 352 days |
| 34. | NSW | Sir Charles Cowper (1807-1875) KCMG | Liberalism | 10 January 1861 | 15 October 1863 | 6 years, 352 days |
| 34. | NSW | Sir Charles Cowper (1807-1875) KCMG | Liberalism | 3 February 1865 | 21 January 1866 | 6 years, 352 days |
| 34. | NSW | Sir Charles Cowper (1807-1875) KCMG | Liberalism | 13 January 1870 | 15 December 1870 | 6 years, 352 days |