Abundance, my DOS based data entry language has the following tables
it uses for address validation.  You are welcome to them.  They are
coded in FORTH, so you might need to do a little work to convert them
and update them.

list of legit zip code prefixes

list of zip code/state pairs.

list of area code/state pairs

list of state abbreviations

In Canada the post office has a service to look up an address by
postal code or vice versa.  That might be used on a background thread
for validation. Perhaps there is now something similar in the USA.