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The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level.

There is no zip code 00000. Currently the lowest 5 digit zip code in use is 00501 and it is a unique zip (only a single destination, not a city or community) assigned to the the IRS mail processing center in Holtsville, New York.

Yes, it is possible to publish a research paper without code implementation. In many fields, the focus of the research may be on theoretical or experimental aspects, rather than on the implementation of a specific algorithm or software.

Actually, zip code 99999 doesn't even exist. In fact, the highest real zip code is 99950, for Ketchikan, Alaska. Still, if you scour your database, there's a good chance you'll find more than a few 99999 zip codes. Most organizations find that it's been entered as a placeholder in their shipment database.

A 9-Digit ZIP code, also known as a ZIP+4 code or an extended ZIP code, includes the same information as the 5-Digit ZIP code, plus additional information about a specific delivery route within the delivery area.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

The highest ZIP Code number is 99950 in Ketchikan in Alaska. The lowest ZIP Code number is 00501 which is designated for the Internal Revenue Service in Holtsville, New York.

There are 41,704 ZIP Codes in the country. ZIP Codes range from 00501, belonging to the Internal Revenue Service in Holtsville, NY, to 99950 in Ketchikan, AK. Easiest to remember? How about 12345, a unique ZIP Code for General Electric in Schenectady, NY.