One route exists and it is not one a walk-in shipper can pick. FedEx answers the question on its own shipping FAQ in a single line: “The only way to deliver to domestic P.O. boxes is to select FedEx Ground Economy. This is a contract-only service.” Read 2026-07-29. How that service actually gets a parcel into a lobby box comes next, with what it cost against the postal alternative on two lanes we quoted the same day.
A box number sits inside a Post Office, so the last hundred feet belong to USPS whatever the label says on the front.
The company answers this directly rather than burying it. Two sentences on the U.S. shipping FAQ at fedex.com carry the whole domestic rule, and a third opens a narrow door abroad: shipping to P.O. boxes in Puerto Rico and some international destinations is possible through FedEx Express, and in those cases the shipper is required to provide a valid telephone, fax or telex number. All three were read on 2026-07-29.
The phrase that matters for anyone reading this with one box to send is “contract-only.” It means the economy product is arranged through an account relationship rather than sold at a retail counter, so the answer to the plain question — can I walk in and send this to a box number — is no, regardless of how the address is typed.
FedEx describes the economy product plainly in its own service documentation: “FedEx picks up, sorts, line hauls, and tracks and delivers your packages to the United States Postal Service® (USPS) post office closest to you. The USPS makes final delivery to the residence.” That is the mechanism. The parcel travels on the FedEx network for the long middle and then changes hands, which is exactly why a box number stops being a problem: the carrier holding it at the end is the one that rents the box.
The product page carries the operating limits. FedEx states that “Packages up to 70 lbs. and 130″ in length plus girth can be shipped,” that “The ideal package weight is 1–10 lbs.,” and that “Typically, delivery takes 2 to 7 business days, depending on the distance from the package's origin to its destination.” Each of those lines was read from fedex.com on 2026-07-29. A heavy or long carton is therefore outside the only FedEx service that could have reached the box in the first place.
Rural and small-town addresses are where box numbers cluster, so we ran two of them through our own checkout on 2026-07-29 and kept every row the board returned. The right-hand column applies the carrier rules above: whether that service can be handed a plain box number as the destination.
| Service returned | Price | Transit window returned | Plain box number as destination |
|---|---|---|---|
| UPS Ground Saver | $19.25 | No window returned | Needs a street address |
| UPS Ground | $19.30 | 6-7 business days | Needs a street address |
| USPS Ground Advantage | $21.11 | 5-6 business days | Works, USPS owns the box |
| FedEx Ground Economy | $23.80 | 8-9 business days | The contract-only exception |
| UPS 3 Day Select | $27.17 | 5-6 business days | Needs a street address |
| Service returned | Price | Transit window returned | Plain box number as destination |
|---|---|---|---|
| USPS Ground Advantage | $8.42 | 4-5 business days | Works, USPS owns the box |
| UPS Ground Saver | $9.62 | No window returned | Needs a street address |
| UPS Ground | $10.61 | 4-5 business days | Needs a street address |
| FedEx Ground Economy | $10.66 | 5-6 business days | The contract-only exception |
| USPS Priority Mail | $12.55 | 4-5 business days | Works, USPS owns the box |
The pattern repeats on both lanes and it is the useful part of this page. The one FedEx product that can end at a box number finished behind the postal row on price and behind it on speed: $23.80 against $21.11 with three more days into Montana, and $10.66 against $8.42 with one more day into Maine. Chasing the FedEx exception buys nothing on an ordinary parcel. It exists for volume shippers whose whole book already runs on that network, not for the person with one carton and a box number on a sticky note.
Most people who give a box number have a street they can also give. One message before you buy the label removes the constraint entirely and puts the full board of services back on the table, which on the Montana lane above meant a cheaper row and a faster one.
FedEx will hold a shipment at a location for collection. Its own page states that FedEx holds the package for up to 7 days and then returns it to the shipper, and that collecting it takes a government-issued photo ID, with the tracking number and a second form of ID if the ID address does not match the label. Read 2026-07-29.
USPS offers Street Addressing to box holders whose Post Office supports it: the branch street address plus the box number, which in the postal service's own words lets the holder receive packages from private carriers as long as those packages comply with USPS mailing standards. Only the holder can confirm their branch offers it.
The third option is the one that changes the answer permanently, and it is the recipient's job rather than the shipper's. Our page on Street Addressing sets out the format and the limits. If the destination is staying a plain box number, the practical read of both tables above is to buy the postal row and stop shopping.
The economy product has already been renamed once, and neither carrier announces a change to this material. Both are quoted here as of 2026-07-29; check the wording again before you build a process around it.
Not through anything you can buy over a counter. FedEx names one domestic route to a box number, FedEx Ground Economy, and describes it on its own shipping FAQ as a contract-only service. Its other domestic products need a street address.
Because the last leg is postal. FedEx describes itself collecting, sorting and line-hauling the parcel to the Post Office nearest the recipient, with USPS making the final delivery, so the box number is handled by the carrier that owns the lobby.
Have the shipment held at a FedEx pickup point. FedEx states it holds a package for up to 7 days and then returns it to the shipper, and that collecting it needs a government-issued photo ID.
Where their Post Office offers Street Addressing, yes. USPS describes the option as using the street address of the Post Office combined with the box number, which lets the holder receive packages from private carriers as long as those packages comply with USPS mailing standards.
On both lanes quoted here on 2026-07-29 it was not. The FedEx economy row came back at $23.80 on the Montana lane against $21.11 for USPS Ground Advantage, and $10.66 on the Maine lane against $8.42, and it was the slower row in each pair.