27 Facts About ZIP Codes

ZIP Codes Code is a postal code used by the United States Postal Service.

Term ZIP Codes is an acronym for Zone Improvement Plan; it was chosen to suggest that the mail travels more efficiently and quickly when senders use the code in the postal address.

The term ZIP Codes Code was originally registered as a service mark by the USPS; its registration expired in 1997.

Mr ZIP Codes was often depicted with a legend such as "USE ZIP Codes CODE" in the selvage of panes of postage stamps or on the covers of booklet panes of stamps.

Mr ZIP was featured prominently alongside musical group "The Swingin' Six" in a variety show that the post office used to explain the importance of using ZIP codes.

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ZIP Codes Code is often translated into an Intelligent Mail barcode that is printed on the mailpiece to make it easier for automated machines to sort.

The ZIP Codes Code identifies the diplomatic mission destination and is different from the diplomatic pouch number in the example above.

Unique ZIP Codes are used for governmental agencies, universities, businesses, or buildings receiving sufficiently high volumes of mail to justify the assignment to them of exclusive ZIP Codes.

An example of a private address unique ZIP Codes Code is that assigned to the headquarters of Walmart.

An example of a PO box-only ZIP Codes Code is 22313, used for boxes at the main post office in Alexandria, Virginia, including those used by the United States Patent and Trademark Office.

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 and the fourth and fifth digits representing a group of delivery addresses within that region.

In similar fashion, in areas without regular postal routes or no mail delivery (undeveloped areas), ZIP Codes are not assigned or are based on sparse delivery routes, and hence the boundary between ZIP Code areas is undefined.

Almost all U S government agencies in and around the capital are assigned ZIP Codes starting with 20200 to 20599, which are Washington, D C, ZIP Codes, even if they are not located in Washington itself.

However, the USPTO now uses ZIP Codes assigned to its current locations in Alexandria, Virginia.

However, for many cities that have incorporated since ZIP Codes were introduced, the city name is not the preferred place name.

For example, Centennial, Colorado is divided among seven ZIP Codes assigned to Aurora, Englewood, or Littleton as its preferred place names; none of these seven ZIP Codes carries "Centennial" as a preferred name, and in the ZIP Code directory, Centennial addresses are listed under those three cities.

Many ZIP Codes are for villages, census-designated places, portions of cities, or other entities that are not municipalities.

For example, ZIP Codes Code 03750 is for Etna, New Hampshire, but Etna is not a city or town; it is a village district in the town of Hanover, which itself is assigned the ZIP Codes Code 03755.

Willow Grove, Pennsylvania, served by the 19090 ZIP Codes Code, is a village that straddles the border of Upper Moreland Township and Abington Township, and that post office serves a small portion of Upper Dublin Township.

For example, when a new sectional center facility was opened at Dulles Airport in Virginia, the prefix 201 was allocated to that facility; therefore, for all post offices to be served by that sectional center facility the ZIP Code changed from an old code beginning with 220 or 221 to a new code or codes beginning with 201.

ZIP Codes are used not only for tracking of mail, but in gathering geographical statistics in the United States.

The reason that there is not one ZCTA for every ZIP Codes Code is that PO Boxes are excluded, since only populated areas are included in the Census data.

ZIP Codes are inherently discrete or point-based data, as they are assigned only at the point of delivery, not for the spaces in between the delivery points.

ZIP Codes-Coded data are used in analyzing geographic factors in risk, an insurance and banking industry practice pejoratively known as redlining.

ZIP Codes are regularly used on the Internet to provide a location in situations where an exact address is not necessary but the user's municipality or general location is needed.

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ZIP Codes are used in credit card authorization, specifically Address Verification System.

In some cases, the ZIP Codes Code is the only thing used for AVS, specifically where collecting a signature, or other information is infeasible, such as pay at the pump or vending machines.