Most postal codes do not mix condition limitations (though there’s a couple of exceptions). You can observe the limitations of postal codes and rival the timezone map by using this link, or Google Earth, to map zips to timezones for that claims that are split with a time zone line.
Thinking about this, can zipcode mix condition lines?
Inside a technical sense, Postal Codes aren’t area based, but an accumulation of delivery points. In the condition level, most Postal Codes deliver wholly inside the condition, however a couple of do ship to out-of-condition areas. In the county level, some Postal Codes mix county limitations, but many deliver wholly inside the county.