To determine which state
corresponds to a particular zip code, this function uses a zone table
that consists of the start and end zip code values for each state.
It then finds the corresponding state for that range of zip codes.
The zone table consists of start and end zip code values for each
state to allow for exceptions, and does not validate zip code values.
With very few exceptions,
a zone does not span multiple states. The exceptions are included
in the zone table. It is possible for new zones or new exceptions
to be added by the U.S. Postal Service at any time. However, SAS software
is updated only with each new release of the product.