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63-551: The San Rafael Hills contain all or parts of the communities of City Terrace , La Cañada Flintridge , Pasadena , South Pasadena , El Sereno , Monterey Hills , Montecito Heights , Cypress Park , Mount Washington , Glassell Park and foothills surrounding Eagle Rock , east of the Glendale Freeway including Rancho San Rafael and Chevy Chase Canyon in Glendale . They define the valley area of Pasadena and San Marino, and retain

126-463: A postal inspector . The phrase "zone improvement plan" is credited to D. Jamison Cain , a Postal Service executive. The post office credits Moon with only the first three digits of the ZIP Code, which describe the sectional center facility (SCF) or "sec center". An SCF is a central mail processing facility with those three digits. The fourth and fifth digits, which give a more precise locale within

189-550: A Pasadena historic resource, is located in the San Rafael Hills. Ernest E. Debs Regional Park is a large nature preserve and regional park in the western section of the hills, with walking and bicycle trails. Descanso Gardens , a botanical garden in La Cañada Flintridge, California is located on the northern edge of the hills. Flintridge Sacred Heart Academy , a private all-girls Catholic high school, sits atop

252-555: A cartographic practice. As ZIP Codes are not polygons, but collections of mail routes and points, they are unsuitable for publication or distribution of most data. Polygons for ZIP Codes are not released by the USPS and instead interpolated by 3rd party vendors. These interpolations introduce topological errors and are not standard between vendors. The USPS often discontinues, splits, or otherwise modifies ZIP Codes, making continuous space-time analysis challenging, leading to issues with both

315-429: A city block, a group of apartments, an individual high-volume receiver of mail, a post office box, or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery. However, the new format was not adopted universally by the public; it eventually became obsolete with modern technology. In general, mail is read by a multiline optical character reader (MLOCR) that almost instantly determines

378-476: A consequence, ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area (such as 095 for mail to the Navy, which is not geographically fixed). In similar fashion, 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

441-498: A full, correct ZIP+4 Code and an additional two digits representing the exact delivery point . Furthermore, mail must be sorted in a specific manner to an 11-digit code with at least 150 mailpieces for each qualifying ZIP Code and must be accompanied by documentation confirming this. These steps are usually done with PAVE-certified software that also prints the barcoded address labels and the barcoded sack or tray tags. The assignment of delivery point digits (the 10th and 11th digits)

504-646: A large aquifer on the hills' north side, from the San Gabriel Valley. They were the homeland, with settlements, of the Tongva Native American people for over 8,000 years before the Spanish invasion and colonization of the late 18th century. They are named after the Rancho San Rafael , a 1784 Spanish land grant beyond the hills to the west. The hillside campus of Art Center College of Design ,

567-517: A long city name combined with a multi-letter state abbreviation, such as "Sacramento, Calif." along with the ZIP Code. The abbreviations have remained unchanged, with the exception of Nebraska , which was changed from NB to NE in 1969 at the request of the Canadian Post Office Department , to avoid confusion with New Brunswick . Robert Moon is considered the father of the ZIP Code; he submitted his proposal in 1944 while working as

630-463: A package. As of October 2019 , there are 41,702 ZIP Codes in the United States. Due to convenience, ZIP Codes are used not only for tracking of mail, but also commonly for gathering geographical statistics in the United States by some researchers. ZIP Codes are not created for statistical analysis, thus use for statistical analysis is heavily criticized for numerous reasons and advised against as

693-536: A piece of 3.5 acres (1.4 hectares) terrace that was formed after crews hacked a rugged and barren hill. In 1957, 600,000 cubic yards (460,000 m ) of soil that had been removed from the construction of the Los Angeles Civic Center was transported to the City Terrace County Park. The soil filled a ravine, tripling the park's original acreage. It has swimming, basketball and tennis, plus a playground,

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756-553: A post office to close and its associated ZIP Code to be deallocated. For example, Centralia, Pennsylvania 's ZIP Code, 17927, was retired in 2002, and ZIP Codes for Onoville (14764), Quaker Bridge (14771) and Red House (14773) in New York were prevented from going into use in 1964 in preparation for the Kinzua Dam 's completion. Each ZIP Code has one or more "postal city" names assigned to it. Since ZIP Code boundaries are based on

819-593: A process called ZIP-code marketing. Point-of-sale cashiers sometimes ask consumers for their home ZIP Codes. Besides providing purchasing-pattern data useful in determining the location of new business establishments, retailers can use directories to correlate this ZIP Code with the name on a credit card to obtain a consumer's full address and telephone number . ZIP-Coded data are also used in analyzing geographic factors in risk, an insurance and banking industry practice pejoratively known as redlining . This can cause problems, e.g. , expensive insurance, for people living near

882-641: A region (if applicable) often gets the first ZIP Codes for that region; afterward, the numerical order often follows the alphabetical order. Because ZIP Codes are intended for efficient postal delivery, there are unusual cases where a ZIP Code crosses state boundaries, such as a military facility spanning multiple states or remote areas of one state most easily serviced from a bordering state. For example, ZIP Code 42223 serves Fort Campbell , which spans Christian County, Kentucky , and Montgomery County, Tennessee , and ZIP Code 97635 includes portions of Lake County, Oregon , and Modoc County, California . In general,

945-630: A splash pad, picnic areas and a gymnasium. In addition, City Terrace Park hosts many activities for youth and Teens such as cheer, basketball and computer club, as well as activities for adults and families such as ceramics classes and aquatics programs. The County of Los Angeles Public Library operates the City Terrace Library. The library has been in its current location since 1979 and was refurbished in 2009. The library offers homework help for children and teens, internet resources such as downloadable audio books, and occasionally hosts seminars for

1008-463: A study period. Datasets providing a similar approximate geographic extent to ZCTA are commercially available. Despite these issues, ZCTAs are still very popular with researchers in fields like epidemiology, and among government agencies, with some states employing them to publish and distribute public health data during the COVID-19 pandemic. The data is often used in direct mail marketing campaigns in

1071-562: A town with a high crime rate and sharing its ZIP Code, while they live in a relatively crime-free town. (See Elkins Park, Pennsylvania, above.) California outlawed this practice in 2011. ZIP Codes may not currently be used to identify existing legislative districts. Although the website of the United States House of Representatives has a "Find Your Representative" feature that looks up congressional districts based on ZIP Codes alone, it often returns multiple districts corresponding to

1134-400: A variety show that the post office used to explain the importance of using ZIP Codes. In 1983, the U.S. Postal Service introduced an expanded ZIP Code system that it named ZIP+4 , often known as "plus-four codes", "add-on codes", or "add-ons". A ZIP+4 Code uses the basic five-digit code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as

1197-575: Is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly ( zipping along ) when senders use the code in the postal address . The Philippine Postal Corporation also uses this terminology for the postal code system in the Philippines . Introduced on July 1, 1963, the basic format comprised five digits. In 1983, an extended code

1260-648: Is intended to ensure that every single mailable point in the country has its own 11-digit number. The delivery-point 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. ZIP Codes designate delivery points within the United States (and its territories). There are four types of ZIP Codes: Unique ZIP Codes are used for governmental agencies, universities, businesses, or buildings receiving sufficiently high volumes of mail to justify

1323-589: Is part of the Census-designated place of East Los Angeles. City Terrace is located atop the southeastern San Rafael Hills . The district's steep, winding streets are lined with generally well-preserved Spanish Colonial Revival style houses. Light rail service to Los Angeles is provided by the Metro E Line's Eastside Extension, which opened in 2009. Los Angeles County Metropolitan Transportation Authority (Metro) provides bus service from City Terrace. to throughout

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1386-611: Is that assigned to the headquarters of Walmart (72716). They may also be assigned to a single program, such as the Postal Service's Operation Santa Claus program, under which children are invited to write to Santa Claus at "North Pole 88888". An example of a PO box-only ZIP 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 . In

1449-438: Is therefore committing the ecological fallacy by attempting to disaggregate aggregate data. As ZIP Codes are not continuous, not everyone in the United States has one, and there are ZIP Codes for non-populated or geographic areas, resulting in there not being one ZCTA for every ZIP Code. ZCTAs are not updated as frequently as the USPS updates ZIP Codes, resulting in further temporal analysis issues when ZIP Codes change during

1512-723: Is to the Northwest, and City of Commerce are to the south. Major thoroughfares include Medford st, Eastern Ave., 3rd Street, 4th Street, Evergreen Ave and City Terrace DR. The community is part of ZIP code 90063 and area code 323 . City Terrace is a neighborhood saturated with art. The Goez Art Studio was co-founded by David Rivas Botello, Jose-Luis Gonzalez and Juan Gonzalez in 1969. In 1975, Botello and Wayne Alaniz Healy co-founded Los Dos Streetscapers, later adding Charles Solares, Fabian Debora, George Yepes, Paul Botello, Ricardo Duffy, Rich Raya, and Rudy Calderon to their ranks and renaming themselves East Los Streetscapers. The ceramic mural at

1575-522: Is undefined. For example, some residents in or near Haubstadt, Indiana , which has the ZIP Code 47639, have mailing addresses with 47648, the ZIP Code for neighboring Fort Branch, Indiana , while others living in or near Fort Branch have addresses with 47639. Many rural counties have similar logistical inconsistencies caused by the aforementioned sparse delivery routes, often known as Rural Routes or by some other similar designation. There are generally no ZIP Codes for deliveries to other countries, except for

1638-555: Is used as a building number, while the city in which the embassy or consulate is located is combined with the word "Place" to form a fictional street name. Each mission uses a ZIP+4 Code consisting of 20521 and the diplomatic pouch number. For example, the U.S. Embassy in India has this address in India's postal system: Embassy of the United States of America Shantipath, Chanakyapuri, New Delhi, National Capital Territory of Delhi, 110021 as well as this U.S. address: Embassy of

1701-602: The East Coast , such as 02115 ( Boston ), 10001 ( New York City ), 19103 ( Philadelphia ), 21201 ( Baltimore ), 20008 ( Washington, D.C. ), 30303 ( Atlanta ), and 33130 (Miami) (these are only examples, as each of these cities contains several ZIP Codes in the same range). From there, the numbers increase heading westward and northward east of the Mississippi River , southward west of the Mississippi River, and northward on

1764-1002: The West Coast . For example, 40202 is in Louisville , 50309 in Des Moines , 60601 in Chicago , 63101 in St. Louis , 77036 in Houston , 80202 in Denver , 94111 in San Francisco , 98101 in Seattle , and 99950 in Ketchikan, Alaska (the highest ZIP Code). The first digit of the ZIP Code is allocated as follows: The second and third digits represent the sectional center facility (SCF) (e.g. 477xx = Vanderburgh County, Indiana ), and

1827-515: The modifiable areal unit problem (MAUP) and modifiable temporal unit problem (MTUP). As the ZIP Codes are postal routing numbers, individuals and organizations without concrete spatial locations may be given their own number, making it impossible to associate demographic data with them. Demographic data is not consistent between ZIP Codes, and no effort is made to ensure they are proper enumeration units for analysis. As ZIP Codes are not made with

1890-535: The City Terrace Branch Library, Ofrenda Maya 1, was created by Goez Studios' Jose Luis Gonzalez. Another mural created in 1994 by George Yepes, a member of the East Los Streetscapers who is known for creating the cover art for Los Lobos' 1988 album, is seen on one of the walls at City Terrace Elementary. City Terrace Park was developed in 1933 by Works Progress Administration crews. It occupied

1953-692: The Los Angeles area. In addition, local shuttle service is provided by the El Sol (City Terrace and East Los Angeles Shuttle) and LADOT DASH (City Terrace and El Sereno). City Terrace is bounded by the city limits of Los Angeles on the north and west, Floral Drive, on the south the city limits of Los Angeles. Monterey Park and East Los Angeles on the East. Boyle Heights is on the West, Lincoln Heights , El Sereno , University Hills , California State University, Los Angeles

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2016-454: The SCF, were proposed by Henry Bentley Hahn Sr. The SCF sorts mail to all post offices with those first three digits in their ZIP Codes. The mail is sorted according to the final two digits of the ZIP Code and sent to the corresponding post offices in the early morning. Sectional centers do not deliver mail and are not open to the public, although the building may include a post office that is open to

2079-493: The United States of America 9000 New Delhi Place Washington, DC     20521-9000 Individuals posted at diplomatic missions overseas are now assigned a Diplomatic Post Office address and unique box number. The ZIP Code identifies the diplomatic mission destination and is different from the diplomatic pouch number in the example above. While delivered through the pouch system, mail to such addresses are not considered "Diplomatic Pouch" materials, and as such must adhere to

2142-574: The ZIP Code which are combined with to use for mapping and data presentation. The process of creating ZCTAs and their use for statistical analysis are heavily criticized in the literature. First, the creation of ZCTAs from Census blocks encounters issues when a Census block straddles multiple ZIP Codes. Addressing this is another instance of the MAUP, and the solution of dividing aggregate units between ZIP Codes causes some individuals to fall into ZCTAs that do not match their ZIP Code. The creation of these units

2205-662: The ZIP Codes 01002 and 01003 for Amherst, Massachusetts ; 01002 is used for mail in town, while 01003 is reserved for the University of Massachusetts Amherst . Until 2001, there were six ZIP Codes lower than 00501 that were numbered from 00210 to 00215 (located in Portsmouth, New Hampshire ) and were used by the Diversity Immigrant Visa program to receive applications from non-U.S. citizens. The numbers increase southward along

2268-486: The ZIP+4 Code must be looked up individually for each box (e.g. using the USPS's official ZIP Code Lookup tool, and being sure to enter just city and state, not the 5-digit ZIP). The ZIP Code is often translated into an Intelligent Mail barcode that is printed on the mailpiece to make it easier for automated machines to sort. A barcode can be printed by the sender (some word-processing programs such as WordPerfect include

2331-456: The affected area can notify correspondents, order new stationery, etc. In rapidly growing communities, 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

2394-427: The area surrounding that post office, home and business mail delivery addresses use ZIP Code 22314, a standard ZIP Code. 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 main town in

2457-440: The areas served by each physical post office, they often do not coincide with the boundaries of local government units. For example, suburban and unincorporated areas may share a postal city name with a neighboring municipality, even if no part of its ZIP Code is actually within that city. Delivery services other than the USPS, such as FedEx , United Parcel Service , and DHL , require a ZIP Code for optimal internal routing of

2520-537: The army, and the zone system would enable inexperienced clerks to sort mail without having to learn the delivery area of each city carrier. For example: Mr. John Smith 3256 Epiphenomenal Avenue Minneapolis 16 , Minnesota The "16" is the number of the postal zone in a specific city. By the early 1960s, a more organized system was needed, and non-mandatory five-digit ZIP Codes were introduced nationwide on July 1, 1963. The USPOD issued its Publication 59: Abbreviations for Use with ZIP Code on October 1, 1963, with

2583-653: The assignment to them of exclusive ZIP Codes. Government examples include 20505 for the Central Intelligence Agency in Washington, D.C., and 81009 for the Federal Citizen Information Center of the U.S. General Services Administration (GSA) in Pueblo, Colorado . An example of a university-specific ZIP Code is 21252, which serves Towson University . An example of a private address unique ZIP Code

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2646-455: The center-point of the ZCTAs. 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. The United States Census Bureau then interpolates this discrete data set to create polygons by attempting to match ZIP Code extents with Census blocks. The resulting aerial units represent the approximate extent of

2709-933: The community. The Los Angeles County Department of Health Services operates the Central Health Center in Downtown Los Angeles , serving City Terrace. City Terrace is in the: • 34th US congressional district, represented by Rep. Jimmy Gomez (D) • 51st State Assembly district, represented by Assembly Member Wendy Carrillo • 5th District Los Angeles County Unified School District, represented by Board Member Jackie Goldberg The Los Angeles Unified School District serves City Terrace. The district operates City Terrace Elementary School, Robert F. Kennedy Elementary School, William R. Anton Elementary School, Harrison Elementary School Belvedere Middle School and Esteban Torres High School . ZIP code A ZIP Code (an acronym for Zone Improvement Plan )

2772-459: The correct ZIP+4 Code from the address—along with the even more specific delivery point —and sprays an Intelligent Mail barcode (IMb) on the face of the mail piece that corresponds to 11 digits—nine for the ZIP+4 Code and two for the delivery point. 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 one of the following:

2835-401: The county was 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. On the other hand, depopulation may cause

2898-546: The crest of the San Rafael Hills. City Terrace, California City Terrace is an unincorporated area of East Los Angeles, in Los Angeles County, California , east of Downtown Los Angeles . It contains City Terrace Elementary School, Robert F. Kennedy Elementary School, Esteban Torres High School , Harrison Elementary School, William R. Anton Elementary School, Hammel Street Elementary School, Anthony Quinn Library, City Terrace Library, and City Terrace Park. It

2961-429: The feature), but this is not recommended, as the address-to-ZIP lookup tables can be significantly out of date. Customers who send bulk mail can get a discount on postage if they have printed the barcode themselves and have presorted the mail. This requires more than just a simple font ; mailing lists must be standardized with up-to-date Coding Accuracy Support System (CASS)-certified software that adds and verifies

3024-530: The first three digits designate a sectional center facility , the mail sorting and distribution center for an area. A sectional center facility may have more than one three-digit code assigned to it. For example, the Northern Virginia sectional center facility in Merrifield is assigned codes 220, 221, 222, and 223. In some cases, a sectional center facility may serve an area in an adjacent state, usually due to

3087-423: The fourth and fifth digits represent the area of the city (if in a metropolitan area ), or a village/town (outside metro areas), e.g. 47722 (4=Indiana, 77=Vanderburgh County, 22= University of Evansville area). When a sectional center facility's area crosses state lines, that facility is assigned separate three-digit prefixes for the states that it serves. In some urban areas, like 462 for Marion County, Indiana ,

3150-697: The independent countries of the Federated States of Micronesia , the Republic of the Marshall Islands , and the Republic of Palau , each of which is integrated into the U.S. postal system under a Compact of Free Association . Another exception is ZIP Codes used for overseas stations of U.S. armed forces. Mail to U.S. diplomatic missions overseas is addressed as if it were addressed to a street address in Washington, D.C. The four-digit diplomatic pouch number

3213-698: The lack of a proper location for a center in that region. For example, 739 in Oklahoma is assigned to Amarillo, Texas ; 297 in South Carolina is assigned to Charlotte, North Carolina ; 865 in Arizona is assigned to Albuquerque, New Mexico ; and 961 in California to Reno, Nevada . Many of the lowest ZIP Codes, which begin with '0', are in the New England region. In the '0' region are New Jersey (non-contiguous with

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3276-409: The last four digits of the box number (e.g. PO Box 107050, Albany, NY 12201-7050), zero plus the last three digits of the box number (e.g., PO Box 17727, Eagle River, AK 99577-0727), or, if the box number consists of fewer than four digits, enough zeros are attached to the front of the box number to produce a four-digit number (e.g., PO Box 77, Juneau, AK 99750-0077). However, there is no uniform rule, so

3339-509: The list of two-letter state abbreviations which are generally written with both letters capitalized. An earlier list, publicized in June 1963, had proposed capitalized abbreviations ranging from two to five letters. According to Publication 59 , the two-letter standard was "based on a maximum 23-position line, because this has been found to be the most universally acceptable line capacity basis for major addressing systems", which would be exceeded by

3402-440: The mailing regulations of the host country. An example address is: JOHN ADAMS UNIT 8400 BOX 0000 DPO AE     09498-0048 Like area codes , ZIP Codes are sometimes divided and changed, especially when a rural area becomes suburban . Typically, the new codes become effective once announced, and a grace period (e.g., one year) is provided in which the new and old codes are used concurrently so that postal patrons in

3465-406: The part of researchers. In an attempt to satisfy demand " by data users for statistical data by ZIP Code area", the U.S. Census Bureau calculates approximate boundaries of ZIP Code areas, which it calls ZIP Code Tabulation Areas (ZCTAs). Statistical census data is then provided for these approximate areas. The geographic data provided for these areas includes the latitude and longitude of

3528-482: The public, and most of their employees work the night shift . Items of mail picked up at post offices are sent to their own SCFs in the afternoon, where the mail is sorted overnight. In the case of large cities, the last two digits as assigned generally coincided with the older postal zone number. For example: Mr. John Smith 3256 Epiphenomenal Avenue Minneapolis, MN     554 16 In 1967, these became mandatory for second- and third-class bulk mailers, and

3591-613: The remainder of the '0' area), Puerto Rico , the U.S. Virgin Islands , and APO/FPO military addresses for personnel stationed in Europe, Africa, Southwest Asia, and onboard vessels based in the waters adjoining those lands. The lowest ZIP Code is in Holtsville, New York (00501, a ZIP Code exclusively for the U.S. Internal Revenue Service center there). Other low ZIP Codes are 00601 for Adjuntas, Puerto Rico ; 01001 for Agawam, Massachusetts , and

3654-483: The same SCF, such as in San Diego County, California , where the three-digit prefixes 919 and 920 are used for suburban and rural communities, and 921 for the city of San Diego itself, although all three are processed through the same SCF. Despite the geographic derivation of most ZIP Codes, the codes themselves do not represent geographic regions; in general, they correspond to address groups or delivery routes. As

3717-558: The same considerations as other enumeration units, and is not possible without committing the ecological fallacy . This again becomes an issue with the MAUP. They have been found not to have significant correlations with health indicators, which can lead to poor conclusions. Despite these issues, ZIP Codes remain popular among researchers in fields such as public health due to their convenience, public familiarity with them, ability to anonymize subject addresses through aggregation, and possible ignorance of more appropriate enumeration units on

3780-447: The system was soon adopted generally. The United States Post Office used a cartoon character , which it called Mr. ZIP , to promote the use of the ZIP Code. The name "Mr. ZIP" was coined by D. Jamison Cain. Mr. ZIP was often depicted with a legend such as "USE ZIP 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

3843-618: The three-digit prefix will often exist in one county, while, in rural and most suburban areas, the prefix will exist in multiple counties; for example, the neighboring 476 prefix is found in part or entirely in six counties: Gibson, Pike, Posey, Spencer, Vanderburgh, and Warrick. In some cases, an urban county may have more than one prefix. This is the case with Allen (467, 468), Lake (464, 463), St. Joseph (465, 466), and Vanderburgh (476, 477) counties. Cities like Chicago , Houston , Los Angeles , and New York City have multiple prefixes within their city limits. In some cases, these may be served from

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3906-482: 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

3969-723: Was introduced named ZIP+4 ; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location. ZIP Code and ZIP+4 are registered trademarks of the United States Postal Service, which also registered ZIP Code as a service mark until 1997. The early history and context of postal codes began with postal district/zone numbers . The United States Post Office Department (USPOD) implemented postal zones for 178 large cities in May 1943. Postmaster General Frank Walker explained that many experienced postal clerks were going into

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