Renting a PO Box in California runs from about $4 to $25 a month for the smallest size and climbs past $100 a month for the largest at high-demand locations. The price for any given box depends on three things: the size you rent, the length of the term you prepay, and the specific Post Office you choose. USPS sets fees location by location based on local demand and nearby competition, so two Post Offices a few miles apart can charge very different rates for the same box.1United States Postal Service. Renting a PO Box
Price by Box Size
USPS offers five standard sizes, numbered 1 through 5. All five share a depth of about 14¾ inches; what changes is the front opening.2United States Postal Service. PO Box Sizes Not every Post Office stocks every size, and popular sizes in metro California often sell out.
- Size 1 (extra-small, 3″ x 5½″): fits roughly 10 to 15 letter-sized envelopes. About $5 a month at a rural or suburban office, up to $24 or more in a high-demand urban location.
- Size 2 (small, 5″ x 5½″): holds letters or a few rolled magazines. Roughly $6 to $39 a month depending on location and term.
- Size 3 (medium, 11″ x 5½″): wide enough that magazines and large envelopes lie flat. Prices fall between Size 2 and Size 4.
- Size 4 (large, 11″ x 11″): stacks a couple of shoeboxes with room to spare. Roughly $13 to $71 a month.
- Size 5 (extra-large, 22½″ x 12″): fits flat-rate boxes and parcels. From about $23 to more than $100 a month at premium California locations.
Rental terms come in 3-month, 6-month, and 12-month options, with the longer terms usually working out to a lower monthly rate.1United States Postal Service. Renting a PO Box The 3-month term requires enrollment in automatic renewals with no opt-out. The 6- and 12-month terms let you decide whether to auto-renew.
Why the Same Box Costs Different Amounts
USPS classifies each Post Office as either “competitive” or “market-dominant.” A competitive location sits near private mailbox providers such as The UPS Store; a market-dominant location has no nearby commercial alternatives.3United States Postal Service. DMM Revision – Competitive Post Office Box Service Features Competitive offices, common in dense California cities, generally charge more, but they also bundle features you can’t get elsewhere: street addressing so private carriers like UPS, FedEx, and Amazon will deliver to your box number; email or text alerts when new mail arrives; and a signature kept on file so you don’t have to appear in person to accept most signed items.4United States Postal Service. Customer Agreement for Premium PO Box Service Enhancements Registered Mail, Certified Mail, and Restricted Delivery items still require an in-person signature.
Market-dominant offices, more common in smaller towns and rural areas, tend to be cheaper but offer none of those enhancements.
Extra Costs at Sign-Up
USPS charges a $1.00 refundable deposit per key. You receive two keys when you open the box, so plan on $2.00 up front on top of the rental fee. Additional keys later carry the same $1.00 deposit each, and you get the deposits back when you close the box and return the keys.5Postal Regulatory Commission. Publication 431 – Post Office Box Fees
At competitive locations, new customers often get 13 months of service for the price of 12 on the annual plan, and the deposit is waived for the first two keys.3United States Postal Service. DMM Revision – Competitive Post Office Box Service Features If the office you’re eyeing is competitive, that promotion effectively cancels out a month of rent.
Getting an Exact Price for Your ZIP Code
Because fees vary by location, the only reliable way to see what you’ll actually pay is the USPS PO Box search tool. Enter a ZIP code or street address and you’ll see every Post Office in the area, which sizes are currently available at each, the exact fee for every rental term, and whether the lobby has 24/7 access for box holders.1United States Postal Service. Renting a PO Box The USPS location finder can also filter for offices open evenings, weekends, or around the clock.6United States Postal Service. USPS Find Locations
In Los Angeles, San Francisco, San Diego, and other metros, popular sizes routinely sell out. If your first-choice office doesn’t have what you need, check neighboring ZIP codes. A branch a few miles away may have openings, and often at a lower price tier.
Late Payment and Losing Your Box
The rental fee is due by the 10th of the month your term expires, with a 10-day grace period after that.7United States Postal Service. Policies, Procedures, and Forms Updates Miss both, and USPS closes the box and returns incoming mail to senders. Reopening it means submitting a fresh application, and USPS may charge a lock replacement fee as a penalty for paying more than 10 days late.8United States Postal Service. DMM 508 – Recipient Services You can renew up to 30 days before expiration, and automatic renewal removes the risk of forgetting.
What a PO Box Doesn’t Do in California
A PO Box handles mail; it does not stand in for a residential address on state records. The California DMV requires a physical street address to prove residency for a REAL ID, and while you can list a PO Box as the mailing address on your application, the residency document itself has to show a physical address.9California Department of Motor Vehicles. REAL ID Acceptable Documents List Voter registration and vehicle registration work the same way. If part of the reason you’re renting a PO Box is to keep your home address off public records, that works for mail, but it won’t replace a residential address where the state requires one.