what country is grand cayman islands in
Report Abuse. Grand Cayman Island is the largest island in The Cayman Islands which are an Overseas Territory of the United Kingdom. The Cayman Islands not Grand Cayman is the Country The Cayman Islands as part of UK could be considered part of the Commonwealth but not on their own.JahJah Â· 6 years ago. Thumbs up.est Answer: The Cayman Islands were colonized from Jamaica by the British during the 18th and 19th centuries and were administered by Jamaica after 1863. In 1959, the islands became a territory within the Federation of the West Indies.