What is USPS tracking number breakdown?

A USPS tracking number typically consists of 20 to 22 digits and can also include letters in certain formats. The first two letters indicate the type of service (e.g., "US" for international packages), followed by a series of numbers that uniquely identify the package. In some cases, the tracking number may start with "EA," "EC," or "CP," which denote specific International Shipping services. The tracking number allows customers to monitor the package's journey from origin to destination.