Proof & return receipts
Can you send certified mail to a PO Box?
Updated · By the Certified Letter Online team
Yes. Certified Mail can be addressed to a USPS PO Box: the Post Office places a notice in the box and the box holder or their agent signs for the letter at the counter, which creates the same delivery record. The only catch is legal: some notice rules require delivery to a street or registered-agent address, so check what yours says.
| Address type | Certified Mail works? | Notes |
|---|---|---|
| Street address | Yes | Signature at the door or notice left |
| USPS PO Box | Yes | Notice in box; signed for at the counter |
| Private mailbox (UPS Store, etc.) | Yes | The mailbox store signs as agent |
| APO/FPO/DPO | Yes | Electronic return receipt not available; green card only (USPS DMM 503) |
| Outside the US | No | Certified Mail is a domestic service |
Which address should you use?
- Use the notice address in your contract or bill if it gives one, even if it's a PO Box.
- For billing disputes on a credit card, use the billing-error address on your statement, which is often a PO Box.
- For legal notices to a company, the registered agent's street address is the safest choice. See where to send a certified letter to a company.
Before you send
This guide is general information, not legal advice. For your specific situation, a legal aid office or a licensed attorney in your state can tell you what applies.
Quick answers
Who signs for certified mail sent to a PO Box?
The box holder or someone authorized to pick up their mail signs at the Post Office counter when collecting it.
What if the PO Box holder never picks it up?
It is held for a limited time and returned as unclaimed. See refused or unclaimed certified mail.
Can I send certified mail to an IRS PO Box?
Yes. Many IRS addresses are PO Boxes and certified mail to them is common. The postmarked receipt is what matters for the timely-mailing rule.
What to do next
Send to any US address, PO Boxes included: Certified Mail $14.99, with electronic return receipt $17.99.
Send certifiedSources
- USPS Domestic Mail Manual 503: Extra Services (Certified Mail, Return Receipt, Certificate of Mailing)
- USPS: Insurance & Extra Services
Checked: . General information, not legal advice. Fees and rules change: confirm current values at the official links above.