queen is head of state in which countries
A Commonwealth realm is a sovereign state that is a member of the Commonwealth of Nations and shares the same person, currently Queen Elizabeth II, as its head of state and reigning constitutional monarch, but retains a Crown legally distinct from the other realms. As of 2018, there are sixteen Commonwealth realms: Antigua and Barbuda, Australia, The Bahamas, Barbados, Belize, Canada, Grenada, Jamaica, New Zealand, Papua New Guinea, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Solomon Islands, Tuvalu, and the United Kingdom.