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_ |
|---|---|---|---|---|---|---|
| 5. | TAS | Eric Reece (1909–1999) AC | Australian Labor Party | 26 August 1958 | 26 May 1969 | 13 years, 240 days |
| 5. | TAS | Eric Reece (1909–1999) AC | Australian Labor Party | 3 May 1972 | 31 March 1975 | 13 years, 240 days |
| 6. | WA | Sir David Brand (1908–1990) KCMG | Liberal Party of Australia | 2 April 1959 | 3 March 1971 | 11years, 335days |
| 7. | NSW | Sir Henry Parkes (1815–1896) GCMG | Liberalism | 14 May 1872 | 8 February 1875 | 11 years, 278 days. |
| 7. | NSW | Sir Henry Parkes (1815–1896) GCMG | Liberalism | 22 March 1877 | 16 August 1877 | 11 years, 278 days. |
| 7. | NSW | Sir Henry Parkes (1815–1896) GCMG | Liberalism | 21 December 1878 | 4 January 1883 | 11 years, 278 days. |