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A postal code is a nine-digit number that identifies a particular location. It's similar to a street address, but it's used by the U.S. Postal Service instead of individual homeowners. The postal service uses postal codes to route mail and to keep track of where mail is sent. You can find out your postal code by visiting the USPS website. You can also use a postal code lookup tool to see what businesses are located in a particular postal code. 1. What is a postal code? Postal codes are a series of numbers and letters assigned by the United States Postal Service to individual addresses in the country. They are used to sort mail and to track deliveries. A postal code is also known as a ZIP code. The first two digits are the county, the next two digits are the district, and the last two digits are the section or zone within the district. The US Postal Service makes up ZIP codes where necessary. 2. What does a postal code do? A postal code (or post code) is a unique nine-digit n