USPS Tracking Number

A USPS tracking number is a set of numbers, or a mix of letters and numbers, used to track the delivery of your mail or package. It’s generated when you ship an item and allows you to follow its status from the time it’s accepted to when it’s delivered. You’ll find this number on your receipt, confirmation email, or shipping label, depending on how you sent or received the parcel.

This guide explains how USPS tracking numbers work, where to find them, what they look like, and how to track your shipment, even if the number goes missing. You’ll also learn how Ship24 helps simplify USPS tracking, especially when managing multiple packages across services.

What does a USPS tracking number look like?

USPS tracking numbers vary based on the service used. They can be all numbers or a mix of letters and digits. Most domestic tracking numbers begin with a “9” and have between 20 to 22 digits. International tracking numbers often begin with two letters and end in “US.”

How do I find my USPS tracking number?

Most tracking numbers are found on your shipping receipt, confirmation email, or the label on the package.

If you purchased postage at a USPS location, check the printed receipt. For online purchases, the number is usually in your email or order history. If you’re the recipient, ask the sender to share it with you.

How do I use my USPS tracking number?

To use your tracking number, enter it on the USPS website or a multi-carrier tool like Ship24.

1. Go to Ship24.com or the USPS tracking page.
2. Paste or type your USPS tracking number into the search field.
3. Click search to view current updates, delivery location, and expected arrival time.

Can I track a USPS package without a tracking number?

It’s difficult, but you may still find updates using your USPS account or by contacting support.

If you shipped the item, try checking your online account, shipping receipt, or email confirmation. If you're the recipient, contact the sender or check USPS Informed Delivery if you’re subscribed.

I lost my USPS tracking number—what should I do?

Start by checking your receipt, email, or USPS account. Without a tracking number, full updates may not be available.

If the number is missing, try the following:

• Search your inbox for the shipping confirmation
• Check your USPS account order history
• Review printed receipts from a post office or self-service kiosk
• Ask the sender to confirm the tracking number

What do USPS tracking statuses mean?

Each tracking status gives a snapshot of your parcel’s current location or next step.

Here are some common USPS status messages and what they indicate:

Use Ship24 to Track USPS Packages Across Services

Ship24's tracking API makes it easier for businesses and online sellers to follow USPS deliveries in real time. Instead of checking tracking one by one, Ship24 lets you track multiple shipments at once, across domestic and international USPS services.

It's especially useful for eCommerce platforms and logistics providers looking to centralize updates for customers. Learn more about our USPS tracking API or try it now from our homepage.

FAQs about USPS Tracking Numbers

What is a USPS tracking number?

A USPS tracking number is a unique set of digits or letters used to check the status of a package. You can use it to see updates from the time it’s shipped to when it's delivered.

Where can I find my USPS tracking number?

You’ll usually find your tracking number on the shipping receipt, in your confirmation email, or under the barcode on the label. If someone sent the package to you, ask them to share the number with you.

What does a USPS tracking number look like?

Most USPS tracking numbers have 20 to 22 digits and start with the number 9. International tracking numbers often start with two letters and end with “US.”

Can I track a package without a USPS tracking number?

It’s difficult to track a package without the number. Try checking your email, USPS online account, or shipping receipt. If you're the recipient, the sender may be able to share it with you.

Why isn’t my USPS tracking number working?

The number might not be active yet, or there may be a typo. Make sure you entered it correctly and wait a few hours if it was recently shipped. If the issue continues, contact USPS support.

How many digits are in a USPS tracking number?

Domestic tracking numbers typically have 20 to 22 digits. International tracking numbers are usually 13 characters long and include both letters and numbers.

What should I do if I have lost my USPS tracking number?

Check your email inbox, USPS account, or printed receipts for the number. If you still can't find it, contact the sender or visit a USPS location with your shipping details.