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The first three digits before the hyphen identify the sectional center or large city. The second two classify the post office facility or delivery area. After the hyphen, the first two digits indicate the sector or group of blocks, and the last two identify the segment or one side of a street.

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.

Your zip code is a short sequence of letters and numbers at the end of your address, which helps the post office to sort the mail.

A postal code (also known locally in various English-speaking countries throughout the world as a postcode, post code, PIN or ZIP Code) is a series of letters or digits or both, sometimes including spaces or punctuation, included in a postal address for the purpose of sorting mail.

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.

Your zip code is a short sequence of letters and numbers at the end of your address, which helps the post office to sort the mail.

History & Development. The ZIP in ZIP Code stands for Zone Improvement Plan, and it was introduced July 1, 1963, as part of a larger Postal Service Nationwide Improved Mail Service (NIMS) plan to improve the speed of mail delivery.

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.

There are three main parts of the 5-digit ZIP Codethe national area, the region or city, and the delivery area.

A ZIP Code is a 5-digit number that specifies an individual destination post office or mail delivery area....For example: 42223 spans Christian County, Kentucky, and Montgomery County, Tennessee. 97635 includes portions of Lake County, Oregon, and Modoc County, California. 51023 and 51001 are in both Iowa and Nebraska.