What does USPS "Insufficient Address" mean?
The address is incomplete, so the package is being returned to the sender.
What it means
USPS is explicit that the package is being returned to the sender because some part of the delivery address is missing, incomplete, or incorrect.
Should I worry?
Yes. This is not a delay — USPS says the package is already on its way back.
What you can do now
- Contact the sender with the complete address, including any unit number.
- Ask them to reship once the item reaches them.
Check your own shipment
This page explains the wording. For your specific package, go to USPS tracking , or paste the status into the decoder.
Related statuses
- No Such Number
Checked against USPS's own published page — but not reviewed by a person
Insufficient Address / No Such Number — The package is being returned to the sender. Some part of the delivery address is missing, incomplete, or incorrect and the package can't be delivered.
- https://faq.usps.com/s/article/Where-is-my-package
- Last verified 2026-08-30 by Claude (automated pass against carrier-published pages); authorised by the owner