United States Postal Service (USPS) offer a ZIP code system, which help to easly delive mail to any state, city, town, continetal, Counties, zone and address. United States ZIP code have 5 digit, which was first intruduce in 1963 but later extended to additional 4 digits, form a ZIP+4 code.ZIP code help to sorting courier packages and saving time and cost of shipping a package, where highy volume of mail cames. Some example of ZIP code is Federal Express (FedEx), Deutsche Post DHL (DHL). Allpincode provied facilty to search & find all zone, town, continetal, Counties, address by using ZIP Code Lookup and ZIP Code Finder.
Unique/single high volume address (ex. 20505 for the CIA in Washington, DC) PO Box only (ex. 22313 for the PO Boxes of Alexandria, VA) Military
The first 3 digits of a ZIP code determine the central mail processing facility, it means All mail with the same first 3 digits is first delivered to the same sec center, and the last 2 digits helps to sort and easily distribute mail in local post office.