| # | Country | Head of State | Succession |
|---|---|---|---|
| 1 | Principality of Andorra | Co-Princes | Ex- Officio |
| 2 | Antigua and Barbuda | Queen | Hereditary |
| 3 | Commonwealth of Australia | Queen | Hereditary |
| 4 | Commonwealth of the Bahamas | Queen | Hereditary |
| 5 | Barbados | Queen | Hereditary |
| 6 | Kingdom of Bahrain | King | Hereditary |
| 7 | Kingdom of Belgium | King | Hereditary |
| 8 | Belize | Queen | Hereditary |
| 9 | Kingdom of Bhutan | King | Hereditary |
| 10 | Kingdom of Cambodia | King | Hereditary and elective |
| 11 | Brunei Darussalam | Sultan | Hereditary |
| 12 | Canada | Queen | Hereditary |
| 13 | Kingdom of Denmark | Queen | Hereditary |
| 14 | Kingdom of Eswatini | King | Hereditary and elective |
| 15 | Grenada | Queen | Hereditary |
| 16 | Jamaica | Queen | Hereditary |
| 17 | Japan | Emperor | Hereditary |
| 18 | State of Kuwait | Emir | Hereditary and elective |
| 19 | Hashemite Kingdom of Jordan | King | Hereditary and elective |
| 20 | Kingdom of Lesotho | King | Hereditary and elective |
| 21 | Principality of Liechtenstein | Sovereign Prince | Hereditary |
| 22 | Grand Duchy of Luxembourg | Grand Duke | Hereditary |
| 23 | Malaysia | Yang di-Pertuan Agong | Elective |
| 24 | Principality of Monaco | Sovereign Prince | Elective |
| 25 | Kingdom of Morocco | King | Constitutional |
| 26 | Kingdom of the Netherlands | King | Constitutional |
| 27 | New Zealand | Queen | Constitutional |
| 28 | Kingdom of Norway | King | Constitutional |
| 29 | Sultanate of Oman | Sultan | Absolute |
| 30 | Independent State of Papua New Guinea | Queen | Constitutional |
| 31 | Federation of Saint Kitts and Nevis | Queen | Constitutional |
| 32 | Saint Lucia | Queen | Constitutional |
| 33 | Saint Vincent and the Grenadines | Queen | Constitutional |
| 34 | Solomon Islands | Queen | Constitutional |
| 35 | Kingdom of Saudi Arabia | King | Hereditary and elective |
| 36 | Kingdom of Spain | King | Hereditary |
| 37 | Kingdom of Sweden | King | Hereditary |
| 38 | Kingdom of Thailand | King | Hereditary |
| 39 | State of Qatar | Emir | Hereditary |
| 40 | Kingdom of Tonga | King | Hereditary |
| 41 | Tuvalu | Queen | Hereditary |
| 42 | United Arab Emirates | President | Hereditary and elective |
| 43 | United Kingdom of Great Britain and Northern Ireland | Queen | Hereditary |
| 44 | Vatican City State | Pope | Elective |
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