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The lowest ZIP Code number is 00501, unique for the Internal Revenue Service in Holtsville, NY.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. The first number of the five-digit code signifies the region which the address is located in, a number that grows from the east coast to the west.

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.

United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area.

For a residential address, the format is to list the recipient's name first, then their street address, then their city and state and then put the zip code on the final line. Not only is it important to write legibly, but you should avoid using abbreviations you are not sure of.

'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. It means to mark something with a ZIP code, as in "Be sure to zip-code that letter."

Despite the geographic derivation of most ZIP Codes, the codes themselves do not represent geographic regions; in general, they correspond to address groups or delivery routes.The USPS ZIP Codes identify the individual post office or metropolitan area delivery station associated with mailing addresses.