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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 874 | Independent state | Ingolfur Arnarson | ||
| 1262 | Part of Norway Kingdom | |||
| 1904 | 1 february | Danish self-governing State | Hannes Hafstein (I) | |
| 1909 | 31 march | Björn Jonssón | ||
| 1911 | 14 march | Kristján Jónsson | ||
| 1912 | 25 july | Hannes Hafstein (II) | ||
| 1914 | 21 july | Sigurdur Eggerz (I) | ||
| 1915 | 4 may | Einar Arnórsson | ||
| 1917 | 4 january | Jón Magnússon (I) | ||
| 1918 | 1 december | Kingdom united to Denmark | king Christian X | Jón Magnússon (I) |
| 1922 | 7 march | Sigurdur Eggerz (II) | ||
| 1924 | 22 march | Jón Magnússon (II) | ||
| 1926 | 8 july | Jón Thorláksson | ||
| 1927 | 28 august | Tryggvi Thórhallsson | ||
| 1932 | 3 june | Ásgeir Ásgeirsson | ||
| 1934 | 29 july | Hermann Jónasson (I) | ||
| 1942 | 16 may | Ólafur Thors (I) | ||
| 1942 | 16 december | Björn Thórdarson | ||
| 1944 | 17 june | Republic | Sveinn Björnsson | Björn Thórdarson |
| 1944 | 21 october | Ólafur Thors (II) | ||
| 1947 | 4 february | Stefán Jóhann Stefánsson | ||
| 1949 | 6 december | Ólafur Thors (III) | ||
| 1950 | 14 march | Steingrímur Steinthórsson | ||
| 1952 | 24 january | Steingrímur Steinthórsson, Jón Pálmason, Jón Ásbjörnsson | ||
| 1952 | 1 august | Ásgeir Ásgeirsson | ||
| 1953 | 11 september | Ólafur Thors (IV) | ||
| 1956 | 24 july | Hermann Jónasson (II) | ||
| 1958 | 23 december | Emil Jónsson | ||
| 1959 | 20 november | Ólafur Thors (V) | ||
| 1963 | 14 november | Bjarni Benediktsson | ||
| 1968 | 1 august | Kristján Eldjárn | ||
| 1970 | 10 july | Jóhann Hafstein | ||
| 1971 | 14 july | Ólafur Jóhannesson (I) | ||
| 1974 | 28 august | Geir Hallgrímsson | ||
| 1978 | 1 september | Ólafur Jóhannesson (II) | ||
| 1979 | 15 october | Benedikt Gröndal | ||
| 1980 | 8 february | Gunnar Thoroddsen | ||
| 1980 | 1 august | Vigdís Finnbogadóttir | ||
| 1983 | 26 may | Steingrímur Hermannsson (I) | ||
| 1987 | 8 july | Thorsteinn Pálsson | ||
| 1988 | 28 september | Steingrímur Hermannsson (II) | ||
| 1991 | 30 april | Davíd Oddsson | ||
| 1996 | 1 august | Ólafur Ragnar Grímsson | ||
| Halldór Ásgrímsson | ||||
| 2006 | 15 june | Geir H. Haarde | ||
| 2009 | 26 january | Jóhanna Sigurdardóttir |