Can you send certified mail to a PO Box?
Yes. USPS Certified Mail® can be sent to PO Boxes. Tracking will show delivery attempts or pickup events, and USPS will capture a signature as part of the delivery record.
How delivery usually works
What to expect for PO Box recipients.
USPS may hold the item at the post office for pickup.
The recipient signs when they pick it up (signature recorded).
Tracking shows the outcome (delivered/picked up or returned).
Tips to avoid problems
Small details that prevent delays.
Use the full PO Box address exactly as provided by the recipient.
Include a complete return address.
If you need a signature copy, add return receipt.
Common questions
Ready to send certified mail?
Get tracking and proof of delivery—even for PO Box addresses.
More certified mail guides
Related resources for can you send certified mail to a po box?.