USPS does not set a maximum on how many PO Boxes you can have. You can rent as many as you want, at one Post Office or spread across several, provided you complete a separate application and pay the rental fee for each box. The only real limit is local availability.
The One Situation Where USPS Says No
If a Post Office keeps a waiting list for boxes, existing customers at that location cannot rent additional ones there until the waitlist clears. The rule keeps customers who don’t yet have a box from being shut out by people stockpiling extras. It applies per location, so a waitlist at one office doesn’t stop you from renting a box at another Post Office that has openings.
Aside from that, each application stands on its own. You fill out PS Form 1093, present your ID, and pay the fee, and the box is yours no matter how many others you already hold.
Personal and Business Boxes Count Separately
USPS treats a business as a separate entity from its owner. You can hold a personal PO Box and a business PO Box without one affecting the other, and the same person can be listed on both applications. For a business box, an authorized representative signs the form, and any employees who will pick up mail need to be listed and show their own identification when they collect it.
The Five-Box Online Management Cap
If you manage your boxes through the USPS online portal, the site currently allows up to five PO Boxes per Post Office. That’s a website limitation, not a policy cap on how many you can own. Additional boxes beyond that count can still be rented and managed in person at the Post Office counter.
When USPS May Push You to Add a Box
There is one situation where USPS itself may prompt you toward more than one box. If the volume of incoming mail repeatedly exceeds your box’s capacity, the Post Office may require you to upgrade to a larger box, switch to Caller Service, or apply for additional boxes to handle the overflow. Heavy mail volume is a service issue, not a reason USPS will cap you.
Applying for Each Additional Box
Every box needs its own application, and the ID requirements repeat each time. You complete PS Form 1093 online or at the Post Office and present two forms of current identification. Each applicant listed on a form, including a spouse, has to bring their own ID.
- One photo ID: a valid driver’s license, state ID card, passport, passport card, military or government employee ID, or a university or recognized corporate ID card.
- One non-photo ID that proves your physical address: a current lease, mortgage document, deed of trust, voter registration card, vehicle registration, or home or vehicle insurance policy.
Social Security cards, credit cards, and birth certificates are not accepted. Once the Post Office verifies your information and you pay the rental fee, you receive keys or a lock combination.
You choose a rental term of 3, 6, or 12 months at signup. The three-month term requires automatic renewal with no opt-out. The six- and twelve-month terms let you opt out of auto-renewal and pay manually if you prefer. Each of your boxes runs on its own term and its own renewal date, so if you rent several, keep track of the dates individually. Payment has to arrive by the 10th of the month it is due; if it doesn’t, USPS closes the box on the 11th and starts returning mail to senders.
Why People Rent More Than One
Some renters keep a personal box near home and a business box near their office. Others open a second box in a different city where they spend part of the year. A business with several distinct brands or product lines may want each to have its own mailing address for bookkeeping and customer correspondence. Because USPS charges per box and each application is independent, the practical ceiling is usually your own budget rather than a postal rule. Fees vary widely by location and box size, so the cost of a second or third box at a rural office looks nothing like the cost at a competitive urban location.
What a PO Box Cannot Do, No Matter How Many You Have
Multiple boxes give you more mail capacity and more mailing addresses, but they don’t remove the situations where USPS or other agencies require a physical street address.
Voter registration needs a physical residence address so election officials can assign you to the correct district. A PO Box is not accepted as a voting address anywhere in the United States. You can generally list a PO Box as the mailing address for receiving election materials, but the registration itself requires a street address or a described physical location.
Most states require a physical address for a driver’s license or state ID card, and the same generally applies to vehicle registration. USPS also prohibits using the Street Addressing format (where your mail goes to the Post Office’s street address with a “#” and your box number) as your residence or business address on legal documents. The IRS, by contrast, accepts a PO Box as the mailing address on a federal tax return; the agency needs somewhere to send correspondence, not a home location.
A standard PO Box also only receives mail delivered by USPS. Packages sent through FedEx, UPS, DHL, or Amazon’s own delivery network cannot be delivered to a PO Box number. Street Addressing, offered at competitive PO Box locations subject to availability, is the workaround for boxholders who need private-carrier deliveries. Renting more boxes doesn’t change either of these limits; it just multiplies them.
The Short Version
You can hold as many PO Boxes as you’re willing to pay for and as availability allows. Apply for each one separately with PS Form 1093 and two forms of ID, watch for waiting lists at your preferred Post Office, and expect to manage more than five boxes at a single location in person rather than through the online portal.