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The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.

A 5-Digit ZIP code represents a USPS delivery area. 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.

Zip codes: Use the USPS Zip Code Lookup tool, or search Google or Bing. Find area codes: Type the city and state name, along with area code, into Google, Bing, Yahoo, or Wolfram Alpha. Or, use a specialized website like Area Codes, Country Codes, LincMad, or AllAreaCodes.com.

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.

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.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

A 5-digit number that identifies a particular postal delivery area in the United States.

Once it gets sorted there, it will either get looked up to find the correct zip code and be sent to the correct location. Or it may get stamped ?Undelivered? and the item will be returned to sender.