ZIP Code

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Image:Mr Zip.gif A ZIP Code is the postal code used by the United States Postal Service, which always writes ZIP with capital letters. ZIP is an acronym for the Zone Improvement Plan, but was also meant to suggest that mail travels more efficiently (and therefore faster) when senders use it. The basic ZIP Code format consists of five numerical digits. An extended ZIP+4 code includes the five digits of the ZIP Code, a hypen, and then four more digits, which allow a piece of mail to be directed to a more precise location by the ZIP+4 code alone. ZIP Code was originally registered as a trademark by the U.S. Postal Service, but its registration has since expired.

The term "ZIP Code" is also used in the Philippines to name its postal codes. The Philippine ZIP Code is used by the Philippine Postal Corporation. Unlike American ZIP Codes, Philippine ZIP Codes are four-digit numbers without any extensions. While the cities of Metro Manila use more than one code, towns and cities outside Metro Manila are assigned only one code for per town or city.

Contents

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Background

The postal service implemented postal zones for large cities in 1943. For example:

John Smith
3256 Epiphenomenal Avenue
Minneapolis 16, Minnesota
Wikimedia Foundation Inc.
200 2nd Ave. South #358
St. Petersburg 1, Florida

The "16" in the first example and "1" in the second is the number of the postal zone within the city.

By the early 1960s a more general system was needed, and on July 1, 1963, non-mandatory ZIP Codes were announced for the whole country. Robert Moon, an employee of the post office, is considered the father of the ZIP Code. He first submitted his proposal in 1944 while working as a postal inspector. The post office only gives credit to Moon for the first 3 digits of the ZIP Code, which describe the region of the country.

In most cases, the last two digits of the ZIP Code coincide with the older postal zone number, thus:

John Smith
3256 Epiphenomenal Avenue
Minneapolis, Minnesota 55416
Wikimedia Foundation Inc.
200 2nd Ave. South #358
St. Petersburg, Florida 33701

In 1967, these were made mandatory for second- and third-class bulk mailers and the system was soon adopted generally. The United States Post Office used a cartoon character, Mr. ZIP, to promote use of the ZIP Code. He was often depicted with a legend such as "USE ZIP CODES" in the selvage of panes of stamps, or on labels contained in, or the covers of, booklet panes of stamps. Ironically, the only time the Postal Service issued a stamp promoting the ZIP Code--in 1974--Mr. Zip was not depicted.

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Postal abbreviations

In addition, two-letter abbreviations were introduced for states, eliminating the need to write the state's name out in full.

Wikimedia Foundation Inc.
200 2nd Ave. South #358
St. Petersburg, FL 33701

For example, California is CA. Abbreviations are also assigned for U.S. insular areas like Puerto Rico (PR) and American Samoa (AS), as well as for several former U.S. Trust Territories in the Pacific, such as the Federated States of Micronesia (FM), which are now separate countries. Nebraska was originally assigned the abbreviation (NB) but that was changed to (NE) to avoid confusion with the Canadian province of New Brunswick

Similarly, US military addresses also have their own abbreviations. Mail to these addresses is sent to the Army (or Air Force) Post Office (APO) or Fleet Post Office (FPO). Instead of a state abbreviation, (AA), (AE) or (AP) is used. These may also be used for mail to many US diplomatic missions overseas.

For more efficient use of its optical-character-recognition mail-sorting equipment, the Postal Service advises mailers to eliminate punctuation from addresses on mail pieces: for example, "St. Petersburg, FL" should be rendered "St Petersburg FL".

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ZIP+4

In 1983, the US Postal Service began using an expanded ZIP Code system called "ZIP+4", which are often called "plus-four codes" or "add-on codes."

Wikimedia Foundation Inc.
200 2nd Ave. South #358
St. Petersburg, FL 33701-4313

A ZIP+4 code uses the basic 5-digit ZIP plus an additional 4-digits to identify a geographic segment within the 5-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery. Use of the plus-four code is not required except for certain presorted mailings. In general, mail is read by a Multiline Optical Character Reader (MLOCR) that instantly determines the correct ZIP+4 code from the address and—along with the even more specific Delivery point—sprays an 11-digit POSTNET barcode on face of the mailpiece. This technology has greatly increased the speed and accuracy of mail delivery and in turn, kept costs nearly constant for over a decade.

For Post Office boxes, the general (but not invariable) rule is that each box has its own ZIP+4 code. The add-on code is often either the last four digits of the box number or 0 plus the last three digits of the box number. However, there is no uniform rule, so the ZIP+4 code must be looked up individually for each box.

It is common to use add-on code 9998 for mail addressed to the postmaster (to which requests for pictorial cancellations are usually addressed), 9999 for general delivery, and other high-numbered add-on codes for business reply mail. For a unique ZIP code (explained below), the add-on code is typically 0001.

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Postal bar code

Image:Zip 5 postnet.png Image:Zip plus 4.png

The ZIP Code is often translated into a barcode called POSTNET, that is printed on the mailpiece as well, to make it easier for automated machines to sort the mail. Unlike most barcode symbologies, POSTNET uses long and short bars, not thin and thick bars. The barcode can be printed by the person who sends the mail (some word processing programs such as Word Perfect include the feature), or the post office will put one on when they receive it. The post office generally uses OCR technology, though a human may have to read the address if absolutely necessary. (The automated machinery has the unfortunate tendency to paste the coding over the bottom half-inch of postcards, often obliterating the signature.)

People who send bulk mail can get a discount on postage if they have pre-printed the barcode themselves. This requires more than just a simple font; mailing lists must be standardized with up-to-date CASS certified software that adds/verifies a full, correct ZIP+4 code and an additional two digits representing the exact Delivery point. Furthermore, mail must be presorted in a specific scheme and be accompanied by documentation verifying this. These steps are usually done with PAVE certified software that also prints the barcoded address labels and barcoded sack or tray tags.

This means that that every single mailable point in the country has its own 11-digit number (at least in theory). The Delivery point digits (the 10th and 11th digits) are calculated based on the primary or secondary number of the address. The USPS publishes the rules for calculating the Delivery point in a document called the CASS Technical Guide. The last digit is always a check digit, which is obtained by summing the 5, 9, or 11 digits, taking the Modulo base 10 of this sum (i.e. the remainder after dividing by 10,) and finally subtracting this from 10. (Thus, the check digit for 10001-0001 00 would be 7, or 1+1+1=3 and 10−3=7.) An application needs only to print something like /100010001007/ in the 12-point POSTNET font to create a valid barcode. The slashes "/" are translated into start/stop characters (one long bar,) and each digit is translated into a sequence of two long bars and three short bars.

On business reply mail, the FIM code primarily indicates the orientation (facing) of the mailpiece, since there is generally not a stamp or postage meter imprint containing fluorecent ink (which is usually used by the facing machine to orient mail.) Additionally, FIM codes A and C indicate that a POSTNET bar code is present, allowing this mail bypass the Multiline Optical Character Reader and go straight to a Barcode Scanning Machine (BCS). For that reason, even though courtesy reply mail and metered reply mail are mailed with a stamp or postage meter imprint, they typically carry a FIM code, namely FIM A, to indicate that the POSTNET bar code is present.

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Structure and allocation

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By geography

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 more specific areas, such as small towns or regions of that city. The main town in a region (if applicable) often gets the first ZIP Codes for that region; afterwards, the numerical order often follows the alphabetical order.

Geographically, many of the lowest ZIP Codes are in the New England region, since these begin with '0'. Also in the '0' region are Puerto Rico, the US Virgin Islands and APO/FPO military addresses for personnel stationed in Europe. Some low ZIP Codes are: 00501 for Holtsville, New York (a unique ZIP Code for the U.S. Internal Revenue Service center there); 00601 for Adjuntas, Puerto Rico; 01001 for Agawam, Massachusetts, and 01002 for Amherst, Massachusetts.

The numbers increase southward along the East Coast, such as 02115 (Boston, Massachusetts), 10036 (New York City), 19103 (Philadelphia, Pennsylvania), 20008 (Washington, DC), 30303 (Atlanta, Georgia), and 33130 (Miami, Florida). From there, the numbers increase heading westward and northward. For example, 40202 is in Louisville, Kentucky, 50309 in Des Moines, Iowa, 60601 in Chicago, Illinois, 75201 in Dallas, Texas, 80202 in Denver, Colorado, 94111 in San Francisco, California, 98101 in Seattle, Washington, and 99950 in Ketchikan, Alaska.

Image:ZIP code zones.png The first digit of the ZIP Code is allocated as follows:

Other U.S. territories have codes starting with 9. However, with the expansion of ZIP Codes, the assignment of the first digit to a group of states has broken down. For example, ZIP Codes beginning with 0 and 1 are in use in New York; beginning with 2 and 5, in the District of Columbia; and beginning with 7 and 8, in Texas.

The next two digits represent the sectional center facility (sorting facility for a region) (e.g. 432xx = Columbus OH), and the fourth and fifth digits represents the area of the city (if in a metropolitan area), or a village/town (outside metro areas): 43209 (4=Ohio,32=Columbus,09=Bexley). When a sectional center facility's area crosses state lines, that facility is assigned separate three-digit prefixes for the states that it serves; thus, it is possible to identify the state associated with any ZIP Code just by looking at the first three digits. Often, the last two digits are assigned in alphabetical order to each community for sortation centers that serve multiple cities.

It is important to note that despite the geographic derivation of most ZIP Codes, the codes themselves are not geographic regions, but simply categories for grouping mailing addresses. ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area. Similarly, in areas without regular postal routes (rural route areas) 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.

For example, U.S. Government agencies in the nation's 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. While the White House itself is physically located in ZIP Code 20006, it specifically has the ZIP Code 20500. The Nuclear Regulatory Commission is physically located in Rockville, Maryland, at ZIP Code 20852, but has been assigned by the Postal Service the address Washington, DC 20555. The Patent and Trademark Office used to be physically located in Crystal City, Virginia at ZIP Code 22202, but was assigned by the Postal Service the address Washington, DC 20231; however, since its move to Alexandria, Virginia, it uses the ZIP+4 code 22313-1450.

Unusually, localities are assigned ZIP Codes which do not match the rest of their state's. This is when a locality is so isolated that it is served from a sectional center in another state. For example, Fishers Island, NY bears the ZIP Code 06390 and is served from Connecticut--all other New York ZIP Codes (excepting those at Holtsville for the IRS) begin with "1".

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ZIP Codes only loosely tied to cities

An address's ZIP Code and the "city" name written on the same line do not necessarily mean that that address is within that city. The Postal Service designates a single "default" place name for each ZIP Code. This may be an actual incorporated town or city, a subentity of a town or city, or an unincorporated census-designated place. Additional place names, also of any of these types, may be recognized as "acceptable" for a certain ZIP Code. Still others are deemed "not acceptable", and if used, may result in a delay in mail delivery.

The ideal, of course, would be that the "default" place name is the actual city or town that the address is located in. However, for many cities that have incorporated since ZIP Codes were introduced, the actual city name is only "acceptable" and not the "default" place name. Many databases automatically assign the "default" place name for a ZIP Code, without regard to any "acceptable" place names. For example, Centennial, Colorado, the largest city to incorporate in U.S. history, is divided between seven ZIP Codes, each of which either has "Aurora", "Englewood" or "Littleton" as its "default" place name. Thus, postally speaking, the city of Centennial and its 100,000 residents do not exist - they are postally part of Aurora, Englewood or Littleton: in the ZIP Code directory, Centennial addresses are listed under these three cities. And since it is "acceptable" to write "Centennial" in conjunction with any of the seven ZIP Codes, one can write "Centennial" in an address that is actually in Aurora, Englewood, or Littleton, as long as it is in one of the shared ZIP Codes.

"Acceptable" place names are often added to a ZIP Code in cases where the ZIP Code boundaries divide them between two or more cities, as in the case of Centennial. However, in many cases only the "default" name can be used, even when many addresses in the ZIP Code are in another city. For example, approximately 85% of the area served by the ZIP Code 85254, to which the place name "Scottsdale, Arizona" is assigned, is actually inside the city limits of neighboring Phoenix. This is because the post office that serves this area is in Scottsdale. This has led some residents of the ZIP Code to believe that they live in Scottsdale when they actually live in Phoenix. A city of Scottsdale website listing the positive and negative aspects of the city mentioned the 85254 ZIP Code as a positive aspect, because "Scottsdale" is being used for businesses located outside the city limits in Phoenix. This phenomenon is repeated across the country. The previously mentioned Englewood is a land-locked, inner ring suburb that was built out by the 1960s. Its post office served the area which is now the high-growth southern tier of the Denver metropolitan area, and ZIP Codes in this area were assigned "Englewood" as their "default" place name. An employment center as large as downtown Denver has grown in this area, and its office parks are the headquarters for many internationally-recognized corporations. Even though they are actually located in other cities, they indicate "Englewood" as their location, as this is the "default" postal place name. As a result, there are really two "Englewoods" - the actual city, small and with a largely working-class residential population; and a number of miles away, the postal "Englewood", a vast suburban area of upscale subdivisions and office parks which have nothing to do with the City of Englewood yet share a split identity with it solely because of ZIP Codes. People who say that they live or work in "Englewood" and identify closely with it may rarely enter the actual city of that name.

Finally, many ZIP Codes are for villages, census-designated places, portions of cities, or other entities that are not municipalities. For example, ZIP Code 03750 is for Etna, NH, but Etna is not a city or town; it is actually a village district in the town of Hanover, which itself is assigned the ZIP Code 03755.

The postal designations for place names become de facto locations for their addresses, and as a result, it is very difficult to convince residents and businesses that they actually are located in another city or town different from the "default" place name associated with their ZIP Code. Because of the confusion and lack of identity generated by this situation, some cities, such as Signal Hill, California, have successfully petitioned the Postal Service to change ZIP Code boundaries or create new ZIP Codes, so that their city can be the "default" place name for addresses within the ZIP Code.

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Division and reallocation of ZIP Codes

Like area codes, ZIP Codes are sometimes divided and changed, especially when a rural area becomes suburban. Typically, the new ZIP Codes become effective once announced, and a grace period (e.g., one year) is provided in which the new and old ZIP Codes are used concurrently, so that postal patrons in the affected area can notify correspondents, order new stationery, etc.

Most significantly, in rapidly developing suburbs, it is sometimes necessary to open a new sectional center facility, which must then be allocated its own three-digit ZIP Code prefix or prefixes. Such allocation can be done in various ways. 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. However, when a new sectional center facility was opened to serve Montgomery County, Maryland, no new prefix was assigned. Instead, ZIP Codes in the 207 and 208 ranges, which had previously been assigned alphabetically, were reshuffled so that 207xx ZIP Codes in Montgomery County were changed to 208xx codes, while 208xx codes outside that county were changed to 207xx codes. Because Silver Spring (whose postal area includes Wheaton) has its own prefix, 209, there was no need to apply the reshuffling to Silver Spring; instead, all mail going to 209xx ZIP Codes was simply rerouted to the new sectional center facility.

ZIP Codes also change when postal boundaries are realigned. For example, at the same time at which the above-noted change in Montgomery County took place, and under pressure from then D.C. Mayor Marion Barry, the USPS realigned the postal boundary between the District of Columbia and Maryland to match the actual boundary. Previously, many inner suburbs, such as Bethesda and Takoma Park, had been in the Washington, D.C., postal area. As a result of the change, ZIP Codes in Maryland beginning with 200 were changed to new ZIP Codes beginning with 207, 208, or 209, depending on their location, and ZIP Codes straddling the D.C.-Maryland line were split. For example, 20014 (Bethesda) became 20814, while the Maryland portion of 20012 (Takoma Park) became 20912.

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By type/use

There are three types of ZIP codes: unique (assigned to a single high-volume mailer), PO box-only (used only for PO boxes at a given facility, not for any other type of delivery), and standard (all other ZIP codes). As examples of unique ZIP codes, certain governmental agencies, universities, businesses, or buildings that receive extremely high volumes of mail have their own unique ZIP Code, such as 81009 for the Federal Citizen Information Center (FCIC) of the U.S. General Services Administration (GSA) [1] in Pueblo, Colorado, 21250 for University of Maryland Baltimore County, 30385 for BellSouth in Atlanta, 12345 for General Electric in Schenectady, New York, 10048 for the World Trade Center complex in New York, New York (until its destruction on September 11, 2001) and 77230 for victims of Hurricane Katrina being housed at the Houston Astrodome. The White House has its own secret ZIP+4 Code, separate from the publicly-known 20500, for the President of the United States and his family to receive private mail [2]. An example of a "PO box-only" ZIP code is 22313, which is used for PO boxes at the main post office in Alexandria, Virginia. In the area surrounding that post office, home and business mail delivery addresses use ZIP code 22314, which is thus a standard ZIP code.

The above will be made clearer by examining the allocation of ZIP codes in Princeton, New Jersey:

  • 08540 - standard (deliveries in most of the Princeton postal area)
  • 08541 - unique (Educational Testing Service)
  • 08542 - standard (deliveries in the central area of the borough of Princeton)
  • 08543 - PO box only (PO boxes at the main post office)
  • 08544 - unique (Princeton University)

Another type: M - Military 34036, Military - Armed forces Americas (except Canada)

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Other uses

Delivery services other than the USPS, such as Federal Express, United Parcel Service, and DHL require a ZIP code for the optimal internal routing of a package. This spares customers from being required to use some other routing designator, such as the IATA code of the destination airport or railhead.

ZIP Codes are used not only for tracking of mail, but in gathering geographical statistics in the United States. The U.S. Census Bureau keeps track of the latitude and longitude of the center-point of each ZIP Code, a database which numerous other companies sell. The data are often used in direct mail campaigns in a process called ZIP Code marketing, developed by Martin Baier. Point of Sale cashiers sometimes ask consumers what ZIP Code they live in order to collect corporate purchasing pattern data. The corporation or specialists then analyze these data to determine the location of new business establishments. Finally, ZIP-coded data is also used in analyzing geographic factors in risk, an insurance industry and banking practice pejoratively known as redlining.

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Pop culture

  • Starting in 2000, National Geographic magazine instituted a regular monthly feature which focuses on the community served by one ZIP code.
  • ZIP codes can take on a certain amount of cachet or become bywords: 90210 in Beverly Hills, California being probably the most famous example appears in the titles of two Beverly Hills-centric television shows: Beverly Hills 90210 and Dr. 90210.
  • Public-service announcements for the government's consumer information center have become famous for their ZIP code in Pueblo, Colorado — 81009.
  • Game show viewers of the 1960s, 1970s and 80s became familiar with announcer spots for the Spiegel catalog, and the company's address, "Chicago 60609."
  • The PBS children's series ZOOM made frequent musical use of 02134, the ZIP code of WGBH — the show's originating station in Boston.
  • In 1964, at the height of his popularity, Smokey Bear, mascot of the United States Forest Service, received so much fan mail that he was assigned his own ZIP code, 20252.
  • In a popular episode of the 1960s TV series Batman, the villain Chandell referred to being located in ZIP Code 9999979. Although the producers knew this could not be an actual ZIP Code, it is likely that this was used as an attempt to bring more attention to ZIP Codes as part of mailing addresses.
  • Newton Falls, Ohio has the ZIP Code 44444. During the 1970s, signs at the municipal boundaries proclaimed, "Newton Falls has zip!" The slogan is now in use on a website, 44444.com.
  • On Seinfeld, Newman, a USPS employee, tells his girlfriend "Would you like to know a secret about ZIP Codes? They're meaningless!"
  • On the Simpsons, in the episode titled "The Day Violence Died" the formerly bankrupt Meyers Studios (creators of the Itchy & Scratchy show) is revived after the owner of the defunct studio successfully sues the U.S. Postal Service for copyright infrigement on a character that resembles Mr. Zip, aptly named Manic Mailman.
  • In another Simpsons episode titled "Sunday, Cruddy Sunday," Lisa Simpson asks a postal employee during a class trip to the post office what the purpose of the ZIP+4 code is. Little does she know that she is being monitored by authorities who suspect she has discovered that the code has no importance, albeit the tour guide, Post Master Bill, mentions under his breath that they are "citizen relocation codes" and "hopefully we'll never need them."
  • In the current television mystery series Veronica Mars, "09ers" is a slang term used to refer to students whose families live in the fictional ZIP code 90909, the affluent part of Neptune, California.
  • in the movie based on the Green Acres TV series, Hooterville's ZIP code was given by Mr. Drucker as "40516 and a half". 40516 is in Lexington, KY.
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See also

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U.S. Postal Service codes

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Postal codes in other countries

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External links

de:ZIP Code it:Zip Code ja:ZIP (郵便番号)

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