#US ZIP CODE DATABASE CODE#
The first digit of a USA ZIP code generally represents a group of U.S. 22313 for the PO Boxes of Alexandria, VA)
Unique/single high volume address (ex. Though ZIP codes were originally developed for USPS, many other shipping companies such as United Parcel Service (UPS), Federal Express (FedEx), DHL, and others make use of ZIP codes for sorting packages and calculating the time and cost of shipping a package (the shipping rate). The additional 4 digits help USPS more precisely group mail for delivery. The basic 5-digit format was first introduced in 1963 and later extended to add an additional 4 digits after a dash to form a ZIP+4 code. The term ZIP stands for Zone Improvement Plan. Some still refer to ZIP codes as US postal codes. ZIP codes near me are shown on the map above. US ZIP codes are a type of postal code used within the United States to help the United States Postal Service (USPS) route mail more efficiently. This means that a ZCTA can be in more than one city. We consider a ZCTA to be part of a city if the area intersecting both the ZCTA and city is at least 10 percent of the area of either the city or the ZCTA. Most zip codes are Zip Code Tabulation Areas and are represented as a geographic area. 
Our zip code data comes from our Zip Code Database. Census Bureau, National Weather Service, American Community Survey, and the IRS. It's been built from the ground up using authoritative sources including the U.S.
We're proud to offer a simple, accurate and up-to-date database of US Zip Codes.
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