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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.

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps 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, or a post office box.

Writing the wrong ZIP Code with the right address usually causes the letter to be delivered about a day later than if the ZIPCode were correct. As long as the mailing address is correct, the letter will be delivered.

Because ZIP+4 codes are based on delivery routes, they change when the postal delivery routes are updated by the USPS. That's why ZIP+4 codes can change as often as once a month, since there are several factors that can result in the USPS updating its delivery routes.

Writing Zip Code: A Matter of Style The U.S. Postal Service uses ZIP Code. It also includes a trademark symbol (ZIP Code?) even though available information suggests the mark expired in 1997. The Associated Press Stylebook advises using ZIP code.

Looking up a ZIP+4 with the USPS ZIP Code? Lookup Tool Enter the address you want to look up in the ?Street Address? field. You can also enter a city and state or a ZIP code to narrow down your search. Click the ?Find? button to search for the ZIP+4 code associated with the address.

Look Up a ZIP Code? By Address. Enter a corporate or residential street address, city, and state to see a specific ZIP Code?. Find by Address. By City and State. Enter city and state to see all the ZIP Codes? for that city. Find by City & State. Cities by ZIP Code? Enter a ZIP Code? to see the cities it covers.

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. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

What each number means. The first digit designates a broad area, which ranges from zero for the Northeast to nine for the far West. The two following digits are the code of a central post office facility in that region. The last two digits designate small post offices or postal zones.

To create a personal Zip, a postal customer would go to a postal web site, authenticate who they are, much as they do today to sign up for Informed Delivery, and provide their current address and, optionally, email address. The system would provide them their own 11 (or 12) digit Personal Zip Code.