USPS Customer Service
Service number: 1-800-275-8777
Domestic & International USPS Tracking: 1-800-222-1811
USPS Tracking Number Format
9400 1000 0000 0000 0000 00
0300 0000 0000 0000 0000
9407 3000 0000 0000 0000 00
82 000 000 00
There are also some other less used tracking number formats.
What is the reason for no tracking records?
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.
What are the hours of delivery?
It is advised to check with local office for accurate results, because the hours of delivery vary by product and location.