Yes, you can send USPS Certified Mail to a P.O. Box in the United States. USPS Certified Mail letters are addressed and delivered to the PO Box with no changes in mailers process. In other words you just address the letter using the PO Box instead of the street delivery address.

When the USPS letter carrier delivers the letter, the process that documents when the letter was received at the delivery address is a little bit different. A delivery notification card is placed inside the PO Box instructing the recipient they have Certified Mail waiting for pick up from the Post Office window clerk. Because USPS requires someone to sign for each Certified Mail letter, the delivery notification card must be presented to the window clerk at the USPS Post Office. Then the recipient is presented the delivery confirmation Signature card and the date and time of the delivery confirmation are electronically captured and recorded by USPS. This is how the United States Postal Service handles the delivery of a Certified Mail Letter when you address it to a PO Box.

Other  Frequent Ask Questions on Certified Mail Labels

  • Can I send Certified Mail letters to a military APO address?  No.

  • Can I send Certified Mail letters to Canada?  No. Certified Mail is a product of the United States Postal Service.