How Much Does a USPS PO Box Cost?

Published on July 20, 2026 | Written by Alec Pow
This article was researched using 16 sources. See our methodology and corrections policy.

A USPS PO Box is a locked mailbox inside a post office or postal facility, with pricing set by the United States Postal Service rather than by a private mailbox company. As of July 2026, the USPS PO Box cost can be as low as $21.00 for a 3-month market-dominant group 7 size 1 box and as high as $677.00 for a 6-month competitive C30 size 5 box in the published USPS fee schedule, before key, lock, or renewal decisions.

The entity chain behind the bill starts with USPS, Postal Explorer, Notice 123, USPS.com, PostalPro, the Postal Regulatory Commission, the USPS Office of Inspector General, and Federal Register materials. Together, those sources frame the real buyer decision around fee group, box size, ZIP Code availability, rental term, renewal timing, refund treatment, Premium PO Box Service, street addressing, private-carrier delivery, key deposits, lock events, and no-fee eligibility.

The price is built from box size, fee group, payment term, and event charges after setup. Exact checkout pricing may differ by branch because availability is tied to the ZIP Code search, local inventory, and the payment period selected before reservation.

For mail privacy, small-business correspondence, or a home-address substitute, the unit that matters is the payment term, not a single monthly list price. Fee group, box size, and premium services such as street addressing can move the annual total even inside the same city.

How Much Does a USPS PO Box Cost?

Jump to sections

• Base, as of July 2026, published tables list $21.00 (at $30 per hour, earning that amount would take about 42 minutes, before taxes) for a 3-month market-dominant group 7 size 1 box, $677.00 for a 6-month competitive C30 size 5 box, plus $6.00, $14.00, and $30.00 key or lock charges in the Domestic PO Box table.
• Payment timing is not monthly at checkout. USPS lists 3-month, 6-month, and 12-month options, and the 3-month term requires automatic renewal on the PO Box payment terms.
• Refund exposure changes by term. Active 3-month boxes get no refund, 6-month boxes can get 50% in the first 3 months, and 12-month boxes phase down under active rental refund rules.

What you’re actually buying

A USPS PO Box is a locked mailbox inside a post office or postal facility. The renter receives a mailing address tied to that facility and picks up letters, flats, and eligible parcels there instead of receiving each item at a home or storefront. The box is controlled by the United States Postal Service, not a shipping-store franchise.

It differs from a private mailbox because USPS sets the address rules, facility access, delivery handling, and closure process. It also differs from a virtual mailbox, which may scan or forward mail through a private company. People use one for home-address separation, small-business correspondence, reliable mail pickup near work, or mail storage during moves that keep a stable postal contact point. It works best as a postal pickup point, not as a full mailroom with staff-managed shipping.

USPS PO Box vs private mailboxes

The closest substitute is a private mailbox at a shipping store or commercial mail receiving agency. That route may fit someone who wants staffed package handling, forwarding, or a street-style private business address. A USPS box is different because the address sits inside the postal network, the rental is governed by USPS terms, and pickup depends on the selected facility. For a nearby store comparison, see current UPS mailbox rental costs before treating the two products as interchangeable.

Street addressing narrows the gap, but it does not erase it. PostalPro says the USPS street-addressing option can help customers receive deliveries from private carriers that require a street address, including UPS, FedEx, DHL, and Amazon, through the private-carrier delivery option. Virtual mailbox companies add scanning, app access, and forwarding, which can help remote workers, but they are private services rather than a USPS branch rental. Buyers comparing scan-and-forward services can review how third-party operators explain street-style postal addressing before choosing.

Prices by size, fee group, and term

USPS prices are not one flat national monthly fee. Notice 123 separates PO Boxes into competitive and market-dominant categories, then sorts them by fee group and physical size. Size 1 is the smallest listed size, and size 5 is the largest in the published table. A renter in a lower fee group with light letter mail can land near the low end, while a business that needs a larger box in a competitive location pays far more.

Term length also changes the effective cost. A market-dominant group 7 size 1 box lists at $31.00 (about 1 hour of work at $30 per hour) for 6 months and $21.00 for 3 months, so paying two short terms would be $42.00 for the same 6-month span, or $11.00 above the semiannual fee, based on the current fee schedule table.

USPS table example	3-month listed fee	6-month listed fee
Market-dominant group 7, size 1	$21.00	$31.00
Market-dominant group 5, size 3	$51.00	$86.00
Market-dominant group 1, size 5	$339.00	$553.00
Competitive C37, size 1	$46.00	$80.00
Competitive C30, size 5	$389.00	$677.00

Government fees, keys

The base rental is the main government fee, but it is not the only line a renter may see. Notice 123 lists key deposits, extra key charges after the first two keys, and a lock replacement or late-payment charge. These are event costs, not monthly rent. A careful renter can avoid some of them by keeping the first keys, paying on time, and choosing a size that matches mail volume from the start.

Premium PO Box Service can add useful features where a branch offers them. The USPS customer agreement says street addressing lets a renter use the post office street address with the box number, and it also says the address cannot be used as a physical residence or place of business in legal documents under the street-addressing customer agreement. That policy matters for business owners. It can help with package routing, but it does not turn the box into an office suite.

Renewal cycles, refunds

Renewal risk is part of the price. USPS OIG describes PO Box customers as prepaying for 3, 6, or 12 months and says renewals can begin 30 days before the service period ends in an audit of rent management. The same audit says unpaid boxes can be blocked at the start of the month and closed after a 10-day grace period, with mail returned to senders after closure.

Refund rules make the shorter term less forgiving. USPS general terms say an active 3-month box has no refund, an active 6-month box can get a 50% refund during the first 3 months, and an active 12-month box moves through 75%, 50%, and 25% refund windows before no refund after the beginning of month 10 under the posted refund schedule. A renter who may move soon should weigh that schedule against the lower effective rate of a longer term.

Three mailbox renter cases

These cases are fee-table cases, not customer anecdotes. The budget case is a renter who needs letter privacy and can use a small box in a lower market-dominant fee group. Using the table above, a group 7 size 1 box at $31.00 (about 1 hour of work at $30 per hour) for 6 months keeps the cash outlay low if the renter picks up mail and avoids extra keys. The main driver is low mail volume, not a discount code.

The business case is a seller or consultant who needs more space and wants a stable mailing point. A market-dominant group 5 size 3 box at $86.00 for 6 months is a better fit than the smallest box if flats and small parcels arrive. The high-use case is a competitive C30 size 5 box at $677.00 for 6 months, driven by location and size. Independent 2026 summaries also describe PO Box pricing as dependent on location, size, and rental length in published mailbox price context.

Hidden costs

The practical add-on range runs from a single $6.00 key deposit to a $30.00 lock replacement or late-payment event, with each extra key after the first two at $14.00. The safest way to keep the rental close to the posted fee is to keep the keys, set a renewal reminder, and avoid choosing a box that forces package overflow every week.

Worked total for a one-year renter using a market-dominant group 5 size 3 box is two 6-month payments at $86.00, which make $172.00, then one extra key at $14.00 brings the itemized total to $186.00. The arithmetic is $86.00 plus $86.00 plus $14.00 equals $186.00, using the listed fees in the July 2026 price file. That total excludes postage, forwarding, and any private mailbox service outside USPS. Postage changes are a separate budget line, and letter mailers can compare stamp price changes apart from the box rental.

Who this cost makes sense for

The better fit is a renter who knows the pickup routine and can use the box for steady mail rather than occasional packages. The Federal Register record on private-carrier delivery to premium PO Boxes shows why carrier acceptance belongs in the choice, not just the rent figure, through the premium delivery rule record.

A USPS PO Box makes less sense when the buyer needs scanning, shredding, frequent forwarding, or a staffed commercial address. The price can still be fair, but the service has boundaries.

Makes sense if

• You receive letters or flats and can pick them up at the selected facility.
• You want a mailing address separate from a home address.
• Your nearby office has the size you need in a lower fee group.
• You can keep the box long enough to benefit from the longer rental term.

Doesn’t make sense if

• You need scan-and-forward service built into the plan.
• Your mail is package-heavy and often comes by private carrier.
• You may move before the refund window works in your favor.
• Your local branch only has larger or higher-fee boxes open.

Article Highlights

• The lowest cited USPS PO Box listing in this article is $21.00 for a 3-month small market-dominant box.
• The highest cited listing is $677.00 for a 6-month large competitive-location box.
• Longer rental periods can lower the effective term cost, but refund rules matter.
• Street addressing helps with some package scenarios, but it is not a legal office address.
• Extra keys, lock events, and late payment can add small but avoidable charges.

Answers to Common Questions

Why is my quoted PO Box price different from the table?

Your quote is tied to the post office, box size, fee group, and open inventory. The table gives published USPS examples, but the reservation flow decides what is available at your chosen ZIP Code.

Can I rent a USPS PO Box for one month?

USPS does not present a one-month rental term in the public PO Box flow. The listed payment periods are longer, with automatic renewal tied to the shortest option.

Does street addressing mean I can use the PO Box as a legal business location?

No. Street addressing can help with mail and some private-carrier package delivery, but USPS materials warn that the street-style address is not a physical residence or legal place of business.

Is a USPS PO Box cheaper than a private mailbox?

It can be cheaper for simple letter pickup, especially in a low-fee group. A private mailbox may be worth the higher bill when scanning, forwarding, staff acceptance, or broader package handling is needed.