Postal codes are a set of numbers, a particular set of numbers (although it sometimes includes letters too) that helps postal services determine the destination of a mail. The postal code allows mail to reach its destination, and full ZIP+4 ensures it reaches the destination ASAP.
Articles What Are Postal Codes? Postal codes are strings of numbers (and sometimes letters) that help postal services determine where a piece of mail is being sent to. They help simplify the task of bringing post to its destination.
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