Ensure Your Mailbox Meets USPS Standards
Whether you're installing a new mailbox or replacing an old one, it's important to make sure it meets standards set by the United States Postal Service (USPS). Using a non-approved mailbox could lead to delivery problems or even mail service refusal. Here's how to know if your mailbox is USPS approved, and why that matters.
Why USPS Approval Matters
USPS approval ensures your mailbox is safe, accessible and compatible with mail carrier requirements. If your mailbox doesn’t meet standards, the following can happen:
Your mail carrier might not be able to deliver your mail.
- The USPS may refuse service to your address.
- Your mail could be exposed to theft or weather damage.
- You may have to replace the mailbox at your own expense.
By choosing an approved mailbox, you avoid these risks and help ensure reliable mail delivery.
Types of USPS-Approved Mailboxes
USPS-approved mailboxes fall into two main categories:
- Curbside mailboxes. These are placed at the edge of your property and accessed from a vehicle.
- Wall-mounted mailboxes. Typically used in urban areas or where curbside delivery isn’t possible.
Each type has its own set of standards.
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How to Check if Your Mailbox is USPS Approved
Look for a USPS Mark or Label
Most commercially sold mailboxes that meet USPS standards will have a label or marking that says "USPS Approved" or "Approved by the Postmaster General." This is usually found on the inside of the mailbox door or on the packaging.
Verify With the Manufacturer
Reputable brands list USPS approval in their product descriptions online or in-store. If you’re unsure, visit the manufacturer's website or call their customer service to confirm.
Check the USPS Website
The USPS maintains a list of approved curbside mailbox designs. You can visit the website and search for “approved mailbox guidelines” to find the most recent requirements and list of manufacturers.
Curbside Mailbox Standards
If you're installing a curbside mailbox, it must meet these requirements:
Size and Design
- Standard size. Typically, curbside mailboxes are 18.5 inches long, 6.5 inches wide and 8.5 inches tall, though larger sizes are allowed if approved.
- Material. Must be made of durable materials such as metal or heavy-duty plastic.
- Flag. Must have a red signal flag on the right side to indicate outgoing mail.
Placement
- The mailbox should be placed so that the bottom is 41 to 45 inches from the road surface.
- It should be 6 to 8 inches back from the curb or road edge.
- The mailbox must face outward and be easily accessible from a mail vehicle.
Wall-Mounted Mailbox Standards
Wall-mounted mailboxes are often used in areas without curbside delivery. Here’s what USPS requires:
- The mailbox must be big enough to hold a day’s volume of mail, including large envelopes.
- It should be securely attached to the house near the front door.
- The mailbox opening must be easy for the mail carrier to reach without encountering obstacles such as stairs or gates.
What if You're Using a Custom or Homemade Mailbox?
If you're thinking about installing a custom mailbox (for example, a novelty mailbox shaped like a fish or tractor), it still needs to meet USPS standards for size, durability and placement. You must submit your design to the USPS Engineering Department for approval before installation. Failing to do so could result in mail delivery issues.
Community and Cluster Mailboxes
In many newer neighborhoods or apartment complexes, mail is delivered to centralized or cluster mailboxes. These are pre-approved by USPS and maintained by property management or the local postmaster. If you’re responsible for maintaining a unit, any replacements must come from the list of USPS-approved manufacturers.
Final Tips
- Ask your mail carrier. If you're not sure about your current mailbox, your local mail carrier can often tell you if it meets the standards or if changes are needed.
- Regular maintenance. Even an approved mailbox needs to be kept in good condition—rust, broken doors or missing flags can all cause problems.
- Report damaged mailboxes. If your mailbox is damaged by a snowplow or other event, report it to your local post office and replace it with an approved model.
Having a USPS-approved mailbox ensures your mail is delivered safely and consistently. Look for labels, check manufacturer information and follow the USPS guidelines for size, material and placement. With a compliant mailbox, you’ll help your mail carrier do their job efficiently—and keep your mail secure.