The postal-address tag had about 15-20 questions in it, and each one basically belonged to the more popular street-address tag. I've moved each question to the street-address tag, which the wiki entry describes them as being, essentially, postal addresses.
Since they are the same thing, can we merge/alias the two? (Keeping street-address) I work in the address validation industry... and the two terms are used quite interchangeably -- and PO boxes are still street addresses, esp. in the context of dual addresses (don't forget the common edge cases).
(This is part of a larger clean-up effort. See more about the address tag, which needs to be disambiguated.)