The Ultimate Guide to USPS PO Boxes: A Comprehensive Look

If you want a secure and flexible way to receive mail, a Post Office (PO) box from the United States Postal Service (USPS) is a popular option. PO boxes are lockable mailboxes located inside USPS facilities that provide a dedicated space to receive letters and packages. They offer several advantages over traditional home delivery, but also have some key limitations to be aware of.

In this comprehensive guide, we‘ll take a detailed look at everything you need to know about renting and using USPS PO boxes effectively. Our goal is to give you all the facts you need to determine if a PO box is the right mail solution for your needs.

PO Box Usage and Demographics

Let‘s start with some background data on PO box usage in the United States. According to a 2020 USPS report, there are over 21 million PO boxes in use nationwide. This represents about 14% of all delivery points served by USPS.

PO box rentals are especially popular in certain states. The states with the highest number of PO boxes per capita are Wyoming (42 boxes per 1,000 residents), Montana (30 per 1,000), and Alaska (29 per 1,000). In contrast, states like New York, New Jersey, and Massachusetts have some of the lowest PO box densities, with fewer than 5 boxes per 1,000 residents.

So what are the key demographics of PO box renters? A 2019 survey by the USPS Office of Inspector General provides some insights:

  • 61% of PO box renters use their box for personal mail only, while 31% use it for both personal and business mail
  • The most common reasons for renting a box are a desire for more security (46%), more privacy (33%), and greater convenience (26%) compared to home delivery
  • PO box usage tends to skew towards older age groups – 70% of renters are over age 45
  • 47% of renters have a household income under $50,000, while 22% have an income over $100,000

This data shows that while PO boxes serve a wide variety of users, they are especially popular among older individuals, those living in rural areas, and people who prioritize mail security and privacy.

How PO Boxes Work

Now let‘s look at the basics of how PO boxes function. When you rent a PO box, USPS assigns you a unique box number at a specific post office location. This box number effectively serves as your mailing address – all mail pieces addressed to your PO box will be placed in the box by USPS personnel for you to pick up.

To retrieve mail from your box, you‘ll need to visit the post office during open access hours. Most post offices have separate PO box lobbies that remain unlocked even when the main counter is closed. You simply locate your box number and use an assigned key or lock combination to open the box and collect your mail.

PO box sizes and rental fees vary by location, but the most common sizes are:

Size Dimensions Starting Price (3 months)
1 3" x 5.5" $13 – $44
2 5" x 5.5" $16 – $75
3 11" x 5.5" $35 – $150
4 11" x 11" $50 – $360

Larger sizes may be available in some locations. Exact rates depend on the post office location and can be found using the USPS PO Box search tool.

It‘s important to choose a box that‘s adequate for your anticipated mail volume. If you plan to receive packages or a large quantity of mail, a Size 1 box will fill up very quickly. The 11" x 11" Size 4 box is usually sufficient for small business or heavy personal use.

PO Box Addresses and Private Carriers

While having an assigned box number is great, it does come with one very important limitation – only USPS mail can be delivered to a USPS-operated PO box. Private carriers like UPS, FedEx, and DHL will not deliver to these boxes, even if a street address is used.

This is because USPS regulations prohibit any organization besides USPS from placing items into PO boxes. Since the boxes are located inside secure USPS facilities, private carriers cannot access them.

However, there is one notable exception to this rule. In 2020, USPS launched a new "Premium PO Box" (PPB) service in select locations. PPB service provides a few additional benefits compared to regular PO boxes:

  • A real street address can be used in place of "PO Box", e.g. "123 Main St #456"
  • Packages from any carrier can be delivered, not just USPS
  • Signature-required items can be signed for by USPS at no extra charge
  • Email and/or text notifications are sent whenever mail is placed in the box

The tradeoff is that Premium PO Box service is significantly more expensive than a regular box – typically $25-$35 per month. It‘s also only offered in about 1,100 of the 33,000 USPS locations currently. You can check availability in your area with the PPB location search tool.

Is a PO Box Right For You?

It‘s important to understand both the benefits and limitations of PO boxes when deciding if renting one makes sense for your situation. Here are the key advantages of having a PO box:

  1. Security – Mail and packages are held in a locked box inside a secure post office facility, safe from theft, damage, and prying eyes.

  2. Privacy – Using the post office‘s address keeps your real home or business address confidential and out of the public eye.

  3. Consistency – You can keep the same mailing address even if you move locally, since your box stays the same even if your home address changes.

  4. Convenience – Many post office locations offer 24/7 PO box access, so you can retrieve mail on your schedule rather than waiting for a mail carrier delivery.

  5. Business Image – Having a PO box as your official business address can provide a professional image and keep your business mail separate from personal mail.

On the other hand, PO boxes also have some notable downsides to consider:

  1. Cost – Renting a PO box is an additional expense, typically $50 – $360 per year depending on the box size and billing cycle.

  2. Lack of Private Carrier Delivery – Most PO boxes cannot receive deliveries from carriers like UPS or FedEx, which may be a deal-breaker if you frequently receive packages from these services. Be prepared to provide a different delivery address for these shipments.

  3. Size Limitations – PO boxes have fixed sizes, and larger boxes can quickly become expensive. Bulky packages and high mail volume may require frequent trips to the post office to pick up overflow items.

  4. Limited Availability – In some areas, PO boxes may have waitlists or not be available at all due to high demand. You‘re also limited to boxes at post offices within a reasonable distance of your home or work.

  5. Strict Addressing Requirements – Any mail sent to your PO box must include the exact PO box number – items without a box number can be returned as undeliverable. This can be an inconvenience when providing your address to senders.

If you decide a PO box is the right solution, the next step is selecting a box size and location. The USPS PO Box search tool allows you to check availability and pricing at post offices near your address. It‘s wise to choose a box that‘s somewhat larger than your expected regular mail volume to allow for occasional overflow and larger items.

PO Box Alternatives

For some people, the drawbacks of a USPS PO box may be significant enough to explore other options. Here are a few alternatives that offer similar benefits:

  • Private Mailbox Services – Companies like The UPS Store and PostNet offer mailbox rental services that can accept parcels from any mail carrier. Pricing is often comparable to USPS, but with additional services like package notification and mail forwarding.

  • Virtual Mailbox Services – For an entirely online solution, virtual mailbox services like Anytime Mailbox and Traveling Mailbox allow you to view and manage your mail remotely. They provide a real street address and then scan your incoming mail for secure digital viewing.

  • Mail Holding Services – If you only need mail held periodically, such as during extended trips, USPS offers free mail holding for up to 30 days. For longer holds, premium services like USPS Premium Forwarding Service can temporarily redirect your mail to a new address.

Each of these options has its own pricing and features, so it‘s worth comparing them to find the best fit for your needs if a PO box doesn‘t make sense.


USPS PO boxes offer a secure, private, and flexible way to receive mail without using your home address. While they aren‘t the ideal solution for every situation, they can be a great fit for many individuals and businesses.

The keys to using a PO box effectively are:

  1. Choosing the right size box for your needs
  2. Checking it regularly and submitting forwarding/hold requests when necessary
  3. Providing the correct PO box address to all senders
  4. Being aware of the limitations on package delivery from private carriers

Whether you‘re a privacy-focused individual, a frequent traveler, or a small business owner, a PO box can be a useful tool in your communication toolbox. By understanding the ins and outs of USPS PO box services, you can maximize the benefits and minimize the drawbacks. With this knowledge, you‘re well equipped to decide if a PO box is appropriate for your unique mail needs.