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ZIP or Zone Improvement Plan Codes were created by the U.S. Postal Service to improve mail delivery service. They are based on postal routes which factor in delivery-area, mail volume, and geographic location. They are not designed to hold population data and change frequently. Some ZIP Codes may only include P.O.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234).

Yes, when using a ZIP+4 ZIP Code, the number must consist of five digits, a hyphen (or dash), and four digits. Improperly labeled mailpieces may progress slower through the mail system and may be returned to sender if the United States Postal Service® is unable to deliver the item.

Primary state prefixes. ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

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 ZIP number is a structured code in which the first digit identifies one of ten large areas of the Nation, and the second digit indicates a State, a geographic portion of a heavily populated State, or two or more less populated States.

The ZIP code 00001 is one of more than 42,000 five-digit ZIP Codes in the United States. ZIP area 00001 is located in the Dillingham Census Area, state of Alaska.

You are right that the United States Postal Service writes ?ZIP Code? with a capital C?and ZIP in all caps. You're also right about us. Though CMOS doesn't specifically rule on how to capitalize the term, it has rendered it as ?zip code? (all lowercase) since it first appeared in the Manual in 1982 (in the 13th ed.).

United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area. The first digit in a ZIP code represents a defined group of U.S. states.

Initially, the zip code was only a two-digit number: the first denoted the city, the second denoted the state. But as the need for delivery expanded, so did the concept of the zip code. As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone.