It's handy but currently the country code attribute seems broken (or at least with the PHP client)
$selector->fields = array('Id', 'LocationName', 'CanonicalName','DisplayType', 'ParentLocations', 'Reach', 'TargetingStatus', 'CountryCode');
$selector->predicates[] = new Predicate('ID', 'EQUALS', 2084);
Array
(
[0] => LocationCriterion Object
(
[location] => Location Object
(
[locationName] => Ukraine
[displayType] => Country
[targetingStatus] => ACTIVE
[parentLocations] =>
[id] => 2804
[type] =>
[CriterionType] => Location
[_parameterMap:Criterion:private] => Array
(
[Criterion.Type] => CriterionType
)
)
[canonicalName] => Ukraine
[reach] => 4100000
[locale] =>
[searchTerm] =>
[countryCode] =>
)
)