During the first half of the 20th century that was in the 1900`s day the primary way of communication is through mails this is primarily made up of social letters that is being transported by train through out the country. And by 1963 the total volume of mails has constituted 80% because of the business mails and by the rapid change of industrialization.

Because of the high demand the Post Office began implementing a coding program they made a new transportation systems and a central distribution point and a five-digit digit code that was assigned to every address in the country that is called a ZIP Code or Zone Improvement Plan. This term was originally registered as a service mark or a type of trademark by the U.S Postal Service but because the registration expired they change its name as a ZIP Code.

The ZIP code is the system of postal codes used by the United States Postal Service (USPS) there are about 43,000 ZIP Codes in the United States. But this is just a approximation because this number can fluctuate by a few thousand ZIP Codes annually. Depending on the number of changes made, because ZIP Codes change on a monthly basis according to the USPS. There are on an average of 25,170 5-digit ZIP Code change every month. 

ZIP codes also has a formats the five numeric digits, the ZIP+4 Code this refers to the 5-digit ZIP code plus a 4-digit add-on number that helps in identifying the geographic segment within the 5-digit delivery area, such as a office building, individual high-volume receiver of mail, or city block, or any other distinct mail unit.   The main purpose of +4 codes is to help in making the delivery and sorting more efficient. ZIP+4 is the primary use in mailing a Business mails, because mailers receive discounts when mail in bulk or carrier route level. The other format is the 3-digit ZIP Codes it refers to the first 3 digits of the 5-digit ZIP Code, Zip codes that starts with 381 are grouped in 3-digit area.

ZIP codes have many uses not only in the USPS as well as to the delivery services. That´s why there´s lots of websites who offers a fast response to those who wants to look for ZIP codes, through this web sites you don´t need to spend in buying software´s for Zip codes list, all you need is to have an access to internet.

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