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A USPS tracking number is a series of numerals allocated to individual parcels by the United States Postal Service to keep a record of where parcels are once they are shipped. A USPS tracking number consists of 22 numerals. Tracking numbers used by USPS are displayed as five groups of four numerals each plus two numbers on the end.What do the first four tracking numbers stand for in USPS?
USPS shipping labels come with a tracking code. The first four digits indicate the type of mail service you're using. The first four or five digits in the tracking number comprise the service code. These numbers denote the type of mail service you're using, and there are hundreds of permutations.