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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.

United States ZIP codes are five numerical digits long.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 ZIP Code is classified as predominately Rural, Urban, or Suburban based on three key factors: population density (people per square mile), distance from nearest city, and size of the nearest city (suburban areas for larger cities extend greater distances).

The 9-digit ZIP Code consists of two sections. The first five digits indicate the destination post office or delivery area. The last 4 digits represent specific delivery routes within delivery areas. ZIP plus 4 codes assist the USPS in effectively sorting and distributing mail.

ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

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

'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."