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A ZIP Code is the postal code used by the United States Postal Service, which always writes it with capital letters. ZIP is an acronym for the Zone Improvement Plan, but was also cleverly meant to imply the fact that mail travels more efficiently (and therefore faster) when senders use it. The basic ZIP Code consists of five numerical digits. An extended ZIP+4 code includes the five digits of the ZIP Code plus four digits which allow a piece of mail to be delivered to a specific address. ZIP Code is a registered trademark of the US Postal Service.

1 Background

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

John Smith 3256 Epiphenomenal Avenue Minneapolis 16, Minnesota

The "16" is the number of the postal zone within the city.

2 Development

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

In 1967, these were made mandatory for second- and third-class bulk mail ers 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 in the 1970s.

2.1 Postal abbreviations

In addition, two-letter abbreviationsStates AK: Alaska AL: Alabama AR: Arkansas AZ: Arizona CA: California CO: Colorado CT: Connecticut DE: Delaware FL: Florida GA: Georgia HI: Hawaii IA: Iowa ID: Idaho IL: Illinois IN: Indiana KS: Kansas KY: Kentucky LA: Louisiana MA: Massachusetts MD: Mary were introduced for states, eliminating the need to write the state's name out in full. For example, CaliforniaCalifornia is a state located in the western United States, bordering the Pacific Ocean. The most populous and third largest state in the U. California is both physically and demographically diverse. The state's official nickname is "The Golden State", wh is CA. Abbreviations are also assigned for U.S. territoriesStates AK: Alaska AL: Alabama AR: Arkansas AZ: Arizona CA: California CO: Colorado CT: Connecticut DE: Delaware FL: Florida GA: Georgia HI: Hawaii IA: Iowa ID: Idaho IL: Illinois IN: Indiana KS: Kansas KY: Kentucky LA: Louisiana MA: Massachusetts MD: Mary like Puerto RicoThe Commonwealth of Puerto Rico ("Estado Libre Asociado de Puerto Rico") is a self-governing unincorporated organized territory of the United States located in the northeastern Caribbean, east of the Dominican Republic. Puerto Rico, the smallest of the Gr (PR) and American SamoaAmerican Samoa is an unorganized, unincorporated territory of the United States in the South Pacific Ocean. Originally inhabited as early as 1000 BC, Samoa was reached by European explorers in the 18th century. International rivalries in the latter half o (AS), as well as for several former U.S. Trust Territories in the Pacific, such as the Federated States of MicronesiaThe Federated States of Micronesia are a constitutional government in free association with the United States, located in the Pacific Ocean, northeast of Papua New Guinea. The Federated States of Micronesia were formerly part of the Trust Territory of the (FM), which are now separate countries.

Similarly, US military addresses also have their own abbreviationsStates AK: Alaska AL: Alabama AR: Arkansas AZ: Arizona CA: California CO: Colorado CT: Connecticut DE: Delaware FL: Florida GA: Georgia HI: Hawaii IA: Iowa ID: Idaho IL: Illinois IN: Indiana KS: Kansas KY: Kentucky LA: Louisiana MA: Massachusetts MD: Mary. Mail to these addresses is sent to the Army (or Airforce) Post Office (APO) or Fleet Post Office (FPO). This may also be used for mail to many US diplomatic missions overseas.

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