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By far the best answer is to use Drop Down Lists for State, and Country. Just to give you an idea there are 84052 acceptable US City St Zip combinations on just the first 5 digits.There are 249 valid countries as per the ISO and there are 65 US State/Territories.This question and its answers are frozen and cannot be changed. The letters appear to be literal, so a completely compliant validator would either allow characters, or possibly hardcode the only exception.
What you can do is when the user select's their country, then enable validation.
I still see addresses like this: XYZ College IT Department City, St ZIP The worst part is the mail 99% of the time is delivered, the other 1%, well that is returned for an incomplete address as it should.
In an earlier post someone mentioned USPS CASS, that software is not free.
Examples of PO Box zips are 00604 - RAMEY, PR and 06141 - HARTFORD, CT.
The the whole need to validate zip codes can really be a question of how far do you go, what is the budget, what is the time line.