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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.

Use a Certificate of Mailing. Certificate of Mailing service provides a postmarked mailing receipt as evidence that your item was mailed. This is all you need to do: Complete PS Form 3817 at the time of mailing.

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.

While a 5 digit zip code will usually get your letter or package to its final destination, those extra 4 digits almost guarantee it. The 6th and 7th digits of a ZIP+4 indicate a ?delivery sector,? like a group of streets, P.O. boxes, a group of buildings, or even a single high-rise building.

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.

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

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. ... First by zip code then by address. It will likely go to the Post Office of the zip code.

CASS (Coding Accuracy Support System) and NCOA (National Change of Address) are two methods of address data verification. CASS tells you if an address can receive mail. NCOA provides the current address for your recipient assuming they have filed a USPS change of address within the last 48 months.