How to Format a Mailing Address When You Have a PO Box

The basic format for a PO Box address

A PO Box address replaces your street address on mail and packages. Instead of writing your house number and street name, you write the box number at your post office. The format is straightforward: your name on the first line, then "PO Box" followed by your box number, then your city, state, and ZIP code.

Here is what it looks like in practice:

James Rodriguez PO Box 1247 Denver, CO 80202

That is all a postal worker needs to deliver your mail. The PO Box number takes the place of a street address entirely — you do not include both. If you write a street address and a PO Box on the same envelope, mail carriers will be confused about where to deliver the item.

Key Takeaways

Write your name on line one, then "PO Box" plus your box number on line two, then city, state, and ZIP code on line three.
Never include both a street address and a PO Box on the same piece of mail — choose one or the other.
Online forms often have separate fields for street address and PO Box; fill only the PO Box field if that is where you receive mail.
Some services and retailers will not accept PO Box addresses for shipping physical goods, though they usually accept them for billing.
Your ZIP code must match your PO Box location, not your home address, even if they are different.

Filling out online forms with a PO Box

Many websites ask for a street address in a field labeled "Street Address" or "Address Line 1." If you have a PO Box, type "PO Box" followed by your box number directly into that field. Some forms will not accept "PO Box" in a street address field because their system expects a number and street name.

When this happens, look for a separate field or checkbox labeled "PO Box" or "Use PO Box as mailing address." Click that option and enter your box number in the field that appears. If no such option exists and the form will not accept your PO Box, contact the company's customer service — they can often override the field requirement or provide you with an alternative way to enter your information.

Leave the "Street Address" field blank if you are using a PO Box field instead. Do not try to force a PO Box into a street address field by adding fake information — this creates delivery problems later.

When retailers and services will not accept a PO Box

Some online retailers, particularly those selling physical goods, will reject PO Box addresses at checkout. This happens because delivery services like UPS and FedEx cannot deliver to PO Boxes — they need a physical street address. USPS can deliver to PO Boxes, but many retailers use multiple carriers and set their system to accept only street addresses.

For these orders, you have two options: provide a street address where you can receive packages, or contact the retailer before ordering to ask if they can make an exception. Some will ship to a PO Box if you call and request it manually.

Billing addresses, by contrast, almost always accept PO Boxes. Credit card companies, insurance providers, and subscription services typically have no problem sending bills to a PO Box. The restriction usually applies only to physical product shipments.

Differences between your PO Box ZIP code and your home ZIP code

Your PO Box is located at a specific post office, and that post office has its own ZIP code. Even if your home is in a different ZIP code, you must use the post office's ZIP code when addressing mail to your PO Box. Using your home ZIP code will send the mail to the wrong location.

You can find your PO Box's correct ZIP code on your rental agreement from the post office, or by calling the post office where you rent the box. Write down the correct ZIP code and use it every time you give out your address. When filling out forms online, make sure the ZIP code field matches your PO Box location, not your residence.

Abbreviations and formatting details

"PO Box" is the standard abbreviation used by USPS. You may also see "P.O. Box" with periods, and both are correct — postal workers recognize both formats. Stick with whichever style your post office uses on your rental agreement.

Some older mail systems or international addresses use "Box" instead of "PO Box," but in the United States, "PO Box" is the format that works everywhere. Do not abbreviate it further to just "Box" unless you are certain the recipient knows you mean a post office box.

Always capitalize "PO" and "Box" or use "P.O. Box" with capitals and periods. Lowercase versions like "po box" or "po Box" may be read incorrectly by automated mail sorting machines.

Mailing packages to a PO Box

USPS can deliver packages to PO Boxes of any size, as long as the box is large enough to hold the package. If a package is too large for your box, the post office will hold it and send you a notice to pick it up at the counter.

Private carriers like UPS and FedEx cannot deliver to PO Boxes under any circumstances — they require a physical street address. If someone is sending you a package through UPS or FedEx, you must provide them with your street address, not your PO Box. You can use your home address, a workplace address, or a UPS Store address (which can receive UPS packages).

When ordering online, check which carrier the retailer uses before entering your address. If they use USPS, your PO Box works fine. If they use UPS, FedEx, or a combination of carriers, provide a street address instead.

International mail and PO Boxes

International mail sent to a US PO Box works the same way as domestic mail — address it exactly as you would address a letter within the United States. The sender writes your name, PO Box number, city, state, and ZIP code, and USPS delivers it to your box.

If you are sending mail internationally from a PO Box, write your PO Box address as the return address on the envelope. Some countries' postal systems handle PO Boxes differently, so if you are receiving mail from overseas, confirm with the sender that they have your correct PO Box address and ZIP code.

Frequently Asked Questions

Can I use a PO Box as my billing address?

Yes. Banks, credit card companies, insurance providers, and most subscription services accept PO Box addresses for billing. They send statements and notices to PO Boxes without issue. Only physical product retailers sometimes reject PO Boxes, and only at shipping checkout.

What if a form asks for both a street address and a PO Box?

Fill in the PO Box field with your box number and leave the street address field blank, or fill the street address field with your PO Box information. Do not enter your home address in the street field and your PO Box in another field — this creates confusion about where to send mail. Contact the company if you are unsure which field to use.

Will my mail get lost if I give someone the wrong ZIP code with my PO Box?

Likely yes. Mail sorted to the wrong ZIP code goes to the wrong post office. Always use the ZIP code of the post office where your PO Box is located. If you are unsure, call that post office and confirm the correct ZIP code before giving out your address.

Can I receive packages from Amazon at my PO Box?

Amazon uses USPS for some shipments and UPS or other carriers for others. Check your order confirmation to see which carrier is delivering. If it says USPS, your PO Box works. If it says UPS, FedEx, or another carrier, you must change the address to a street location before the order ships.

Is "PO Box" the same as "mailbox"?

No. A PO Box is a box you rent at a post office and is part of the official mail system. A mailbox is typically a box at your home or business where mail is delivered. They are different services with different addresses.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.