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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.

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.

Thus there are 1,000,000,000 different ZIP codes. (b) There are 10 possible digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. A ZIP code is a number consisting of 9 digits.

Full 9 Digit ZIP Code Benefits (ZIP+4 Lookup) That simple 9-digit number makes routing more efficient since the USPS knows which mail person will put the letter in the mailbox. Completing ZIP+4s on your mail can speed up processing and delivery, sometimes by as many as two days.

Due to an increase in population or to the improve postal operations, the US Postal Service® will occasionally add a new ZIP Code or change ZIP Code boundaries.

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.

The five-digit code which initially specified an area or a part of a town was no longer accurate or efficient enough. So, USPS created 9-digit ZIP Codes to ensure fast and accurate mailings. They indicate the actual path the mail should travel and usually they narrow down to somewhere between ten to twenty homes.