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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.

The correct ZIP+4 decreases the number of times a piece of mail is handled, too. This means that misdelivery or error is significantly reduced as a result. Since ZIP+4 codes are based on delivery routes, this information can change as frequently as once every two months.

How often are new ZIP codes created? It is typical for 10-20 new ZIP codes to be created each year - many of which are for military uses.

Delivery addresses do not require ZIP+4 Codes. However, ZIP+4 codes require an address to be first ZIP+4 Codes are based on actual delivery routes. This means that they can change fairly regularly. Some resources state that the USPS can update a ZIP+4 Code as frequently as once in two months.

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.

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.

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.

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.

The 61401 ZIP code, which includes the city of Galesburg, Illinois, has some of the least expensive housing in the United States. The typical area home that sold in 2020 went for just $68,000.

You are right that the United States Postal Service writes ZIP Code with a capital Cand 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.).