The Eastern Caribbean Supreme Court ( ECSC ) is a higher court for the Organisation of Eastern Caribbean States ( OECS ) , including six independent states : Antigua and Barbuda , the Commonwealth of Dominica , Grenada , Saint Kitts and Nevis , Saint Lucia , Saint Vincent and the Grenadines and three British Overseas Territories ( Anguilla , British Virgin Islands , and Montserrat ) . The Eastern Caribbean Supreme Court ( ECSC ) is a superior Court of record for the Organisation of Eastern Caribbean States ( OECS ) , including six independent states : Antigua and Barbuda , the Commonwealth of Dominica , Grenada , Saint Kitts and Nevis , Saint Lucia , Saint Vincent and the Grenadines and three British Overseas Territories ( Anguilla , British Virgin Islands , and Montserrat ) .