Courier
Track USPS Shipments
Priority Mail, First-Class and international USPS parcels
USPS tracking number formats
Knowing which format you are holding tells you which USPS service carried it.
About USPS
USPS handles the final delivery for a large share of US e-commerce, including parcels that begin their journey with another carrier. That handover is where visibility is usually lost — the original carrier stops scanning and USPS picks the parcel up under a different number.
Worth knowing: If a parcel shipped by FedEx SmartPost or UPS Mail Innovations goes quiet, it has probably transferred to USPS for the last mile. The original number often keeps working, but the detailed scans move to the USPS one.
Why track USPS here instead of on their site
USPS's own tracking page answers one question about one parcel. If you ship regularly, the problem is different: parcels move across several carriers, and someone has to notice when one of them stops. Shyppy keeps USPS shipments on the same board as your ocean containers, air waybills and every other courier, emails you when a status or ETA changes, and gives customers a share link so they stop asking you for updates.
Common questions
How long is a USPS tracking number?
Domestic numbers are 20 to 22 digits, typically starting 94, 92 or 93. International items use the 13-character format of two letters, nine digits and a country code.
What does 'In transit, arriving late' mean?
USPS expected the item to reach a facility by a certain point and it has not. It is not lost — the estimate has simply slipped, usually by a day or two.
Why did my carrier hand the parcel to USPS?
Economy services such as FedEx SmartPost and UPS Mail Innovations use USPS for final delivery. The parcel changes network near its destination.
Track other couriers
Track USPS with everything else
Ocean, air and 1,000+ couriers on one board, with alerts when something changes.
Start Tracking Free