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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.

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

A ZIP Code is a 5-digit number that specifies an individual destination post office or mail delivery area. ZIP Codes determine the destination of letters for final sorting and delivery. Each ZIP Code designates a collection of delivery routes used by mail carriers and areas serviced by the USPS.

Also called plus-four codes, add-on codes, or add-ons, the ZIP+4 code starts with the standard five-digit ZIP Code. 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.

A ZIP code is a postal code used by the United States Postal Service (USPS) in a system it introduced in 1963. An extended ZIP+4 code was introduced in 1983 which includes the five digits of the ZIP code, followed by a hyphen and four additional digits that reference a more specific location.

Also called plus-four codes, add-on codes, or add-ons, the ZIP+4 code starts with the standard five-digit ZIP Code. 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.

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.