It started to be used by the United States Postal Service (USPS) in 1963. Zip codes are still widely used today. A postal code is a combination of several numbers that are unique to a particular geographic area. Postal codes in America are usually 5-6 digits long. To give an example, if a suffix is added to the end of the 90210 zip code, it may appear as 90210-12421.
The initial purpose of postal codes was to prevent letters and mail sent throughout the country from being confused due to similarity of names and to ensure faster delivery. Each postal code is unique and specific to the region to which it belongs. In this way, mail is prevented from being mixed up or delivered to the wrong address.
Postal codes cover everything from the largest cities to rural areas. Sometimes large cities may have more than one zip code. This makes mail delivery within that city more practical. In rural states, a zip code can sometimes cover a very large area.
In America, zip codes have important functions in many areas, going beyond postal services. Zip codes are vital for accurate and fast mail delivery, economic analysis, emergency services and more.
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