The Isle Of Man is an interesting place, considering its tiny size. (I have relatives there...) It's part of the EU for some purposes but not others. (No doubt numerous deals and mutually beneficial arrangements over the years have now been enshrined in law...)
By the way, notice that Croatia doesn't appear in the European Union in my Mathematica (9.0.1.0).
CountryData["EuropeanUnion"]
{"Austria", "Belgium", "Bulgaria", "Cyprus", "CzechRepublic", "Denmark", "Estonia", "Finland", "France", "Germany", "Greece", "Hungary", "Ireland", "Italy", "Latvia", "Lithuania", "Luxembourg", "Malta", "Netherlands", "Poland", "Portugal", "Romania", "Slovakia", "Slovenia", "Spain", "Sweden", "UnitedKingdom"}
although Wolfram|Alpha knows better.