What is Postal Code in USA?

 Whether you are sending your parents or friends a birthday card, a letter for Christmas or a package to your friend from abroad, it needs to have a postal code in order to get there. However, what is a postal code exactly? Is it simply a number that is used to identify an area? The answer is no, a postal code is not just random numbers put together, but it’s an alphanumeric identifier that helps sort your mail for delivery.



Postal codes, also known as zip codes, are a standard coding system for the United States which was created specifically to facilitate faster mail processing and sorting. This is because the codes divide regions into simple geographic groups and makes it easier for courier companies to know which part of the country they should be in to deliver your package to you.

The first digit of the zip code represents the state to which the direct mail is being sent. The second digit represents the city of destination. The third digit is a reference to the district and the fourth digit denotes the sorting facility. For example, the ZIP code for Buffalo is 14083, which means it is part of the Buffalo SCF.

The USPS has also introduced an expanded ZIP Code format, called the ZIP+4, which allows for four additional digits after the last one, to specify more specific geographic segments within the five-digit delivery area, such as a large apartment complex, a high volume receiver of mail, or an individual, high-volume receiver of mail. Fortunately, there are many CASS-certified address verification tools and services that you can use to run a full ZIP Code list for all addresses in your database.

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