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United States ZIP codes are five numerical digits long.The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

United States ZIP codes are five numerical digits long.The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

The Zone Improvement Plan, or ZIP code system of addressing, organized mail delivery by dividing the country into 10 regions and assigning five digits increasing in specificity: from region to large sorting centers to smaller post offices.

In 1963 the Post Office Department introduced and vigorously promoted the use of the Zone Improvement Plan (ZIP) Code. The code was originally intended to allow mail sorting methods to be automated but ended up creating unimagined socio-economic benefits as an organizing and enabling device.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone.The final two digits signify the local post office of the address. You may have noticed that zip codes often have a hyphenated four-digit number on the back end which is rarely used.

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.

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.