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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1609 | UK colony | ||
| 1825 | Settlement | cap. Le Cour | |
| 1826 | Alexander Hare | ||
| 1831 | Kingdom | king John Clunies-Ross | |
| 1854 | king John George Clunies-Ross | ||
| 1857 | 31 march | UK crown colony | governor John George Clunies-Ross |
| 1871 | governor George Clunies-Ross | ||
| 1910 | 7 july | governor Sidney Clunies-Ross | |
| 1955 | 23 november | Australian territory | governor John Cecil Clunies-Ross |
| 1978 | 1 september | - | |
| 1984 | Associated state to Australia |