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[ - ] : The required "dash" or "hyphen" separates the first five digits from the last four digits; the +4. [67] : Sector or Several Blocks. [89] : Segment or One Side of a Street.

This is because ZIP code boundaries are based on mail routes and delivery points rather than geographic factors. The U.S. Post Office Department, predecessor to USPS, developed a zoning address system in 1943 as a way to make sorting and delivery of mail easier.

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

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.

ZIP codes, the postal code system used by the US Postal Service (USPS), were introduced in 1963. Their basic, and most familiar, format consists of five digits that indicate a specific delivery area. In 1983, the USPS introduced the extended ZIP+4 code.

There are two types of ZIP codes used in the United States: five-digit (or standard) and nine-digit (or extended). Standard ZIP codes are used in most parts of the country, while nine-digit ZIP codes are used primarily in rural areas.

Zip code refers to a type of postal code and is used primarily in the United States and the Philippines. The postal code, however, is typically utilized by the rest of the countries scattered throughout the world.