In a way Harpers Island is a real Island. It's real because it exists. But it's really called Bowen's Island and it is located in Metro Vancouver in British Columbia, Canada.
No study island is not a real island. It is just an educational test online that will help you throught the grades ok 1st through 8th is is not again a real island! I hope this answered your question...
It probably is because if you watch the episodes of The Suite Life On Deck, all of the places they go to is real. For example, Greece, Rome, France, Morocco. So I think Parrot Island is real. ; )