The PO Box cost in the United States ranges widely because USPS does not use one nationwide rental price. Current six-month charges run from about $31 to $677. Your final bill depends on the mailbox size, Post Office location, and rental term.
For most households receiving ordinary letters, the smallest two sizes are usually enough. Businesses or people receiving frequent packages may need a medium or larger mailbox. Checking prices for nearby Post Offices can also reveal meaningful savings.
2026 USPS Mailbox Pricing at a Glance
| USPS size | Approximate dimensions | 3-month price range | 6-month price range | Typical use |
|---|---|---|---|---|
| Size 1, Extra Small | 3″ × 5.5″ | $21–$98 | $31–$170 | Letters and rolled magazines |
| Size 2, Small | 5″ × 5.5″ | $26–$130 | $41–$225 | Letters, magazines, small parcels |
| Size 3, Medium | 5.5″ × 11″ | $38–$228 | $60–$395 | Large envelopes and several small parcels |
| Size 4, Large | 11″ × 11″ | $55–$259 | $90–$452 | Heavy mail and medium parcels |
| Size 5, Extra Large | 12″ × 22.5″ | $96–$389 | $156–$677 | High-volume mail and multiple parcels |
Quick answer: In 2026, USPS mailbox rentals cost roughly $31 to $677 for six months. Smaller boxes in lower-cost areas sit near the bottom. Large boxes at competitive locations can reach the highest rates. Extra key, lock replacement, and late-payment charges can raise the total.
The ranges above reflect the USPS Notice 123 schedule effective July 12, 2026. USPS also says individual locations may offer different box sizes. Availability depends on the Post Office you choose.
How PO Box Cost Is Determined
Three main factors determine what you pay: location, mailbox size, and rental period. Location often creates the biggest difference between two otherwise identical rentals. USPS assigns Post Offices to different fee groups.
Some locations are classified as market-dominant, while others use competitive pricing. Competitive locations can have higher charges because private mailbox alternatives operate nearby. This explains why the same size can cost much more in another ZIP code.
Size also matters because each larger compartment provides more physical storage. Size 1 is designed mainly for letters and several rolled magazines. Size 5 has enough room for multiple packages.
USPS offers 3-, 6-, and 12-month payment periods through its mailbox service. Three-month rentals require automatic renewal, according to USPS. Six- and 12-month customers can choose whether to use automatic renewal.
How Much Does Each USPS Mailbox Size Hold?
The extra-small option works well for people who collect their mail regularly. USPS says it holds about 10 to 15 letters and three rolled magazines. It can become inconvenient if you receive frequent thick envelopes.
A small mailbox offers more flexibility without moving into a higher-capacity category. USPS says it can hold more than 15 letters and five rolled magazines. It can also fit one Small Priority Mail Flat Rate Box.
Medium boxes provide substantially more horizontal space for larger envelopes. They measure about 5.5 inches by 11 inches at the opening. USPS says they can accommodate two Small Priority Mail Flat Rate Boxes.
Wide and extra-large choices make more sense for heavier mail volume. They can reduce the frequency of counter pickups for items that fit. Packages that exceed the compartment can still be handled separately by the Post Office.
Extra Fees That Can Increase Your Total
Rental charges are not the only possible expense. The July 2026 USPS price schedule lists a $6 deposit for each issued key. The first two keys do not require that deposit at competitive locations.
An additional or replacement key after the first two costs $14. Lock replacement carries a $30 fee under the current schedule. The same $30 amount applies as a late-payment fee.
These charges make timely renewal worthwhile, especially for a low-priced mailbox. A single $30 fee can equal several months of rent in a cheaper location. Keep track of renewal dates and return keys when required.
Can You Get a Free USPS Mailbox?
Some customers can qualify for free Group E service. The program applies when USPS does not provide carrier delivery to an otherwise eligible physical address. Qualification depends on specific postal delivery conditions.
The free service is not designed as a general discount program. USPS normally assigns the smallest available size that can handle the customer’s daily volume. Only one qualifying free box is provided for each eligible delivery point.
If your residence lacks USPS carrier delivery, ask your local Post Office about Group E eligibility. Do not assume that living in a rural area automatically qualifies you. USPS applies specific service and address requirements.
Is a Six-Month Rental Better Than Three Months?
A six-month term commonly provides a lower effective monthly rate than repeated quarterly payments. Consider Size 1 in market-dominant Fee Group 7. Three months costs $21, while six months costs $31 under the July schedule.
Two separate three-month periods would total $42 at that unchanged rate. A six-month payment therefore saves $11 in that example. The exact difference changes by size and fee group.
Longer terms also mean fewer renewal dates to remember. Still, shorter terms can make sense during a temporary move or short assignment. Choose based on both total price and how long you expect to need the address.
Ways to Pay Less for Your Mailbox
Start by checking more than one nearby Post Office before making a reservation. Different locations can fall into different pricing groups. A short additional drive may reduce your six-month expense considerably.
Choose capacity based on normal mail volume rather than the largest item you might receive. USPS can hold oversized items at the counter or place them in eligible parcel lockers. That can make a smaller rental practical for many households.
A mailbox can be especially useful while relocating between homes. If you’re planning a DIY move, Homlyst’s Home Depot and U-Haul rental comparison can help with transportation planning. The site’s Home Depot truck pricing guide also covers short local moves.
People handling smaller hauling jobs can also review Homlyst’s Lowe’s truck rental guide. Combining moving and mailing plans can reduce last-minute address problems. Update banks, insurers, subscriptions, and important contacts after establishing the new mailing address.
Can UPS and FedEx Deliver to a USPS Mailbox?
A standard postal address does not always work for private-carrier packages. Some participating Post Offices offer a feature called Street Addressing. This gives customers an approved street-style format based on the Post Office address.
USPS says eligible Street Addressing customers may receive qualifying packages from UPS, FedEx, DHL, and Amazon. The service depends on availability and postal restrictions. Ask your chosen location whether the feature is offered before relying on it.
Street Addressing does not turn the mailbox into your physical residence. USPS specifically restricts using that address as a residence or business location on certain legal documents. Use it only within the permitted mailing rules.
What Happens When a Package Is Too Large?
A package does not have to fit inside your rented compartment to reach you. USPS may leave a pickup notice when an item is too large. You can then collect it at the service counter.
Some facilities also provide secure parcel lockers. These can let customers retrieve larger items outside normal counter procedures. Availability varies by Post Office and package characteristics.
This system means many people do not need an oversized rental solely for occasional packages. Think about your normal weekly mail instead. Frequent business shipments may still justify paying for additional capacity.
Is Renting a Mailbox Worth the Money?
A postal mailbox can be useful when privacy is more important than home delivery. It separates your mailing address from your residence. It also keeps delivered mail inside a locked postal facility.
Renting one can also help people who move often or operate small businesses. USPS states that many locations provide extended access hours. Some facilities offer additional services such as Street Addressing and Signature on File.
The value is weaker when home delivery already meets your needs. You must travel to the Post Office to collect most items. Compare that inconvenience with the privacy and security benefits before paying.
How to Rent One
Start with the official USPS mailbox search and enter an address, city, state, or ZIP code. Review nearby locations, available sizes, prices, and payment periods. Select the location that fits your budget and collection routine.
You can reserve and pay online when the location supports online registration. USPS then requires you to visit the selected Post Office. Bring the required identification so staff can verify your identity and provide access.
USPS states that customers need two forms of identification during the pickup process. Complete the verification promptly after reserving the rental. Requirements can change, so confirm the instructions shown during your application.
Frequently Asked Questions
What is the average PO box cost per month?
There is no single national monthly price because USPS pricing varies by location and size. Current six-month charges range from $31 to $677. That equals about $5.17 to $112.83 monthly when divided across six months.
How much is the cheapest USPS mailbox in 2026?
The lowest listed six-month rate is $31 for Size 1 in market-dominant Fee Group 7. The corresponding three-month price is $21. Your local Post Office may fall into a different fee group.
How much does a mailbox cost for a year?
USPS offers 12-month payment terms, but pricing depends on the chosen location and size. Using current six-month rates as a simple reference produces a wide annual budget range. Always check the official USPS tool before paying.
Why are prices different at different Post Offices?
USPS assigns facilities to fee groups, so identical sizes can have different prices. Competitive and market-dominant locations use separate rate schedules. Local market conditions therefore affect what customers pay.
Are there fees besides the rental price?
Yes, certain key and lock charges can apply. The current schedule lists a $6 key deposit and a $ 14 additional-key charge after the first two. Lock replacement or late payment currently costs $30.
Can I receive packages from Amazon, UPS, or FedEx?
Possibly, if your selected Post Office offers Street Addressing. This optional service provides an approved street-style delivery format. USPS says qualifying packages from Amazon, UPS, FedEx, and DHL can then be accepted.
Can I use this address when I move?
Yes, it can provide a stable mailing address during a move. You should still update important organizations and file appropriate address changes. USPS also offers mail-forwarding options when closing an existing rental.
Bottom Line
For U.S. customers, current six-month mailbox prices span from $31 to $677. Location creates a large portion of that difference, while capacity also affects the rate. Most personal users can start by comparing Sizes 1 through 3.
Check several nearby Post Offices instead of assuming the closest location has the lowest rate. Compare capacity, access hours, Street Addressing availability, and the full rental term. Then confirm the exact current amount through USPS before making payment.
