Yes, but only when USPS carries the last leg of delivery. Amazon routes PO Box orders through USPS automatically in most cases.
Same day delivery, Amazon Pharmacy, and some oversized items are not eligible. The real driver is which carrier actually completes your delivery.
Amazon ships through USPS, UPS, FedEx, and its own Amazon Logistics vans. Only USPS can reach a PO Box.
Amazon’s system is usually smart enough to route PO Box orders correctly on its own. It is not foolproof, especially with third party sellers.
Why the carrier is what actually matters
The question of does Amazon deliver to a PO Box comes down entirely to carrier assignment, not Amazon’s own policy. Understanding that distinction explains every exception below.
A PO Box only accepts mail carried by USPS. UPS and FedEx trucks do not stop at Post Office box walls.
Amazon Logistics drivers cannot deliver there either. Amazon assigns a carrier to every order based on the item, the seller, and the delivery speed you pick.
When it detects a PO Box address, it generally hands that order to USPS instead of a private carrier. This works well for items Amazon sells and ships itself.
It becomes less reliable once a third party seller fulfills the order their own way.
What will not deliver to a PO Box
A handful of Amazon services simply do not support a PO Box address, regardless of carrier. Same day delivery is the clearest example, since it depends entirely on Amazon’s own local delivery network.
Amazon Pharmacy orders are not eligible either. Large or bulky items rated for freight delivery also fail, since those ship by pallet or by a service that only handles street addresses.
Certain one day and two day guarantees can be unavailable too. The fastest options are often tied to Amazon Logistics rather than USPS.
Third party sellers do not all follow the same rule
Orders sold and shipped by Amazon itself are the most consistent about reaching a PO Box. Amazon controls the whole fulfillment chain, so it can choose USPS whenever a PO Box shows up at checkout.
Third party sellers who fulfill their own orders make their own shipping choices. Some ship everything through USPS and work fine.
Others default to UPS or FedEx and will not deliver to a PO Box at all. If checkout will not accept your PO Box for a specific listing, that is usually the reason. Our carrier comparison tool shows how USPS, UPS, and FedEx differ on PO Box delivery beyond just Amazon orders.
Try a different seller of the same item. You can also check whether the listing is Fulfilled by Amazon before you assume the item cannot reach you.
If Amazon will not ship to your PO Box
Turn on USPS Street Addressing at your Post Office if you have not already. It gives your PO Box a real street address, using the Post Office’s own address plus your box number.
That lets Amazon treat it like a standard delivery address for carrier routing purposes. You can also have the order sent to an Amazon Locker or a nearby pickup counter instead.
Both options exist specifically for people whose home address is not convenient to receive at. Our guide on how a PO Box works covers Street Addressing in more depth, including which other carriers it unlocks.
How to enter your PO Box at Amazon checkout
Enter the address exactly as USPS has it on file for your box. Use your name, then PO BOX and the number, then the city, state, and ZIP code tied to that Post Office.
Do not add your home street address on a separate line. A mixed address can trigger a shipping error at checkout.
For the exact format and the mistakes that most often cause a rejected address, see our guide to writing a PO Box address.
Picking the right box size for Amazon deliveries
An X-Small or Small PO Box handles occasional Amazon orders fine, as long as the packages stay envelope sized. Frequent Amazon shoppers should size up.
Oversized notices become routine in a box that is too small. See our full breakdown of PO Box sizes to match a size to how often you actually order.
Frequently asked questions
Does Amazon deliver to a PO Box?
Yes, in most cases, as long as USPS is the carrier assigned to the order. Amazon generally detects a PO Box address and routes that shipment through USPS automatically.
Why did Amazon reject my PO Box at checkout?
The item or seller may require a carrier that does not deliver to PO Boxes, such as UPS or FedEx for a large item. Try a different seller, or check whether Street Addressing is set up on your box.
Can I get Amazon same day delivery to a PO Box?
No. Same day delivery relies on Amazon’s own local delivery network, which cannot reach a PO Box. Standard shipping through USPS remains available instead.
Does Amazon Prime work with a PO Box?
Standard Prime shipping generally works, since USPS still delivers those orders. The fastest guaranteed options, like same day or certain one day windows, are usually not available.
Can Amazon Pharmacy ship to a PO Box?
No. Amazon Pharmacy orders require a different delivery process and are not eligible for PO Box delivery at all.
What if I need a large item Amazon will not send to my PO Box?
Set up Street Addressing on your box so private carriers can treat it like a standard address. You can also have the item sent to an Amazon Locker or pickup counter instead.
The bottom line
Does Amazon deliver to a PO Box in the end? Yes, but only through USPS, and a few categories like same day delivery and pharmacy orders never qualify.
Orders sold and shipped by Amazon reach a PO Box more reliably than third party listings. If a specific order will not ship to your box, Street Addressing or a nearby Amazon Locker usually solves it.
Enter your address exactly as USPS has it, and size your box for how often packages actually arrive.
