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The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

Each number of a zip code corresponds to a specific piece of information about the destination. The first number, between 0-9, denotes a geographic area of the U.S. The second two numbers of a zip code specify a specific region within that geographic area and the last two are meant to indicate a specific Post Office.

A ZIP+4 code uses the basic five-digit code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, a post office box, or a specific delivery route meaning the actual path the mail truck

The ZIP+4 code is used and assigned by the United States Postal Service (USPS) for routing purposes. The final 4 digits are not required for delivery of your mail and may change frequently.Five-digit ZIP codes also change, but they do so infrequently.

Yes, of course. But if you don't and address (including city and state) too big, there should be room on the same line. A zip code is just written as numbers, fer all.

The first five digits indicate the national area and destination post office / delivery area. The last 4 digits represent specific routes within delivery areas. 9-digit ZIP+4 Codes aid in routing and delivery efficiency.

'Zip-code' Is a Verb Both, Dictionary.com and Merriam-Webster list zip-code as a verb, and they keep it all lowercase and use a hyphen.