Reading a USPS label: tracking, routing and printing identifiers
Distinguish a USPS tracking number from routing data, order references and Label Broker printing codes when reviewing a parcel label.
Reviewed 2026-10-08 · 2 min readIdentify which reference each code represents
A shipping label may contain a parcel tracking number, destination information and a seller’s internal reference. A separate message may also contain a QR code for printing the label. Name each field before copying it into an order or a carrier lookup.
USPS barcode standards describe postal routing components as well as tracking-related identifiers. Label Broker has a separate provider-issued printing ID. A reader can return more data than the number required for the carrier lookup.
Keep the raw read and the human-readable number together
Compare a decoded result with the reference printed on the active label. If the result contains additional routing data, retain the original value and review the supported parsing method rather than deleting digits until a number looks plausible.
| Check | Record or next action |
|---|---|
| Tracking reference | Use the confirmed parcel number for official carrier history. |
| Routing component | Describes destination routing within the barcode format. |
| Order reference | Links the package to the seller or warehouse record. |
| Printing code | Retrieves a provider-issued label through the supported printing route. |
Match the active label to its package
Check the destination, carrier product and order before attaching the label. For multiple parcels, keep each number with the units in that package. Preserve a replacement label’s relationship to the earlier record so old messages can still be explained.
Inspect the final printed copy for legibility and complete code boundaries. A number successfully read from a file does not certify that the physical label is readable after it has been folded, obscured or damaged on the carton.
Use each record for the question it can answer
Use the label provider for issuance or printing questions, the order record for buyer-facing reference corrections and official carrier history for recorded parcel events. Keep physical handover evidence alongside those records.
When asking a warehouse to investigate, identify the affected order, package and active carrier number. Share the relevant reference through the agreed process, with buyer data limited to what that team needs to resolve the issue.