About USPS
USPS is the national postal service of the United States. It delivers letters and parcels to every US address and hands international mail to postal operators abroad.
USPS tracking number format
| Format | Example |
|---|---|
| 22 digits (domestic barcode) | 9400 1000 0000 0000 0000 00 |
| IMpb barcode with ZIP prefix (420 + ZIP + number) | 420 90210 9400 1000 0000 0000 0000 00 |
| International (UPU S10): 2 letters + 9 digits + US | EC123456785US |
Examples show the format only and are not real shipments.
How to track a USPS shipment
- Copy the tracking number from your shipping confirmation.
- Paste it above. We recognise USPS numbers automatically.
- Press Track to see the latest status on the official USPS site.
Frequently asked questions
Where do I find my USPS tracking number?
It is in the shipping confirmation email or SMS from the sender, on your receipt, or printed under the barcode on the shipping label.
My USPS number shows "not found". What now?
New numbers often appear in the carrier's system only after the parcel is first scanned, which can take 24-48 hours after the label is created. Check that the number has no extra spaces or missing characters, and try again later.
Is this the official USPS website?
No. TrackandTrace.com is an independent tracking directory. We detect the carrier and send you to the official tracking result on tools.usps.com.