USPS Package Tracking
The most common tracking number format is 20 digits (e.g. 9999 9999 9999 9999 9999), or a combination of 13 alphabetic and numeric characters, usually starting with 2 alphabets, following by 9 digits, and ending by "US" (e.g. EA 999 999 999 US). Some other less common formats may also exist, such as 10 digits.
If you have any question regarding the delivery process of a package, call [+1] 800-275-8777.
The most common cause of no tracking records is incorrectly typed tracking number. It is advised to check with the sender if you are not sure what the number is. Besides, it takes up to 24 hours for a new package to show up in the system.
It is advised to check with local office for accurate results, because the hours of delivery vary by product and location.