The United States Postal Service is the independent agency chartered by the federal government to deliver mail in the United States. USPS offers several international mailing services including Global Express Guaranteed, Express Mail International, Priority Mail International and First-Class Mail International. You can track mail sent with theses international mailing services by using USPS's online track and confirm tool.
Go to the USPS online track and confirm tool (see Resources).
Enter the tracking number in the text box.
Click the "Go" button to display detailed tracking information about the international package.
Alternatively, you can track your package by calling the USPS customer service phone number at 800-275-8777.