the United States: phone, ZIP code, the individual taxpayer number and the social security number. The taxpayer number comes first because it has the shape of a social security number and the social security number never opens on a 9, so on a value that matches both, the taxpayer number is the right answer. Country groups are meant to be used one at a time: a postal code is five digits in several of them, so two in one detector fight for the same span.
Tags: contact, government-id, identity, location, us