
So, you're looking to install a rural mailbox, huh? Make sure it's at least 6 inches above the ground to prevent water accumulation and damage.
The USPS recommends installing mailboxes in a location that's easily accessible for both mail carriers and homeowners. Consider placing it near the road, but not so close that it's a hazard.
Rural mailboxes should be at least 41 inches wide and 41 inches tall to accommodate standard mailbags. This size ensures that mail carriers can easily deposit and retrieve mail.
A sturdy mailbox is essential for withstanding harsh weather conditions. Look for one made from durable materials like metal or plastic.
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Mailbox Requirements
Your mailbox needs to meet the Postmaster General's (PMG) standards to get approval from your local postmaster. You'll need to show them your plans or custom-made box for approval.
To build your own mailbox, you can write to the US Postal Service Engineering for drawings and measurements.
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The USPS official mailbox regulations state that the mailbox should be positioned at a height between 41″ – 45″. This measurement is from the road surface, not where your post is placed.
If your post is on the downside of a hill, take this into consideration when measuring, as it will position your box lower.
Installation and Placement
The installation and placement of your rural mailbox are crucial for efficient delivery and safety. The post office recommends placing the mailbox 6 to 8 inches from the curb or edge of the road.
To ensure the mailbox is stable but will fall away or break if hit by a car, use a 4-inch by 4-inch wooden support or a 2-inch diameter standard steel or aluminum pipe. Bury the post no more than 24 inches deep.
Here are some key placement guidelines to keep in mind:
- Place the front edge of your mailbox 6-8 inches from the curb or edge of the road.
- On one-way streets, place the mailbox on the right side of the road.
- In rural settings, place the mailbox on the same side as the others on the same road.
- Keep trash cans and vehicles a good distance from your mailbox to allow your carrier enough free clearance.
Approved Boxes
The USPS has specific requirements for approved mailboxes. They come in three categories: traditional, contemporary, and locked, with full or limited service.

To get an approved mailbox, you'll need to check with the USPS first. Unless you get prior permission from your local postmaster, you have to install a box with an approved design.
If you're planning to install a custom box, don't worry, it's not a problem. Just contact the USPS at 1-800-ASK-USPS to locate your local postmaster and request an appointment to discuss your idea.
You can get drawings and measurements for building your own mailbox from the US Postal Service Engineering.
Installing Mailbox Post
Installing your mailbox post requires some careful consideration to ensure it's stable and safe. A 4″ x 4″ wooden support or a 2″-diameter standard steel or aluminum pipe is recommended for maximum stability.
You should avoid using unyielding and potentially dangerous supports, like heavy metal pipes, concrete posts, and farm equipment, as they can be hazardous.
Burying your post no more than 24″ deep is also a good rule of thumb.
Here are some recommended materials for your mailbox post:
- 4″ x 4″ wooden support
- 2″-diameter standard steel or aluminum pipe
Measurements for Installation

The measurements for installation are crucial to ensure your mailbox is accessible and safe for your mail carrier. The box should be 6 to 8 inches from the curb or edge of the road.
Mount the box on a four-by-four wooden support or a 2-inch diameter standard steel or aluminum pipe, which will help the post fall away or break if hit by a car.
In some areas, the post office requests boxes to be grouped together to promote efficient delivery, so it's a good idea to contact your postmaster to determine the best location. You may also be able to mount it directly in front of your home.
The lower level of the box needs to be 41 inches to 45 inches above the surface of the road, measured from the road surface, not where your post is placed.
Tips
Before installing a rural mailbox, it's essential to contact your local postmaster to determine the best location. They can guide you on where to place the mailbox to ensure it meets USPS regulations.
To install the mailbox, it should be 6 inches from the curb and 41 inches above the road on a four-by-four post. This is crucial to ensure safe and efficient mail delivery.
If you're looking for more information, you can check out the resources listed below:
- Mailboss: A Guide to USPS Mailbox Regulations
- USPS.com: Mailbox Guidelines
- USPS.com: Organization Information
Standard Mailboxes, Curbside
If you want to install a standard mailbox curbside, it must meet the USPS size and construction standards.
You can get your custom-made mailbox approved by showing it to your local postmaster, who will verify that it meets the PMG standards.
To build your own mailbox, you'll need to get drawings and measurements from the US Postal Service Engineering department.
You can do this by writing to them to request the necessary plans and specs for your mailbox.
Sources
- https://mailboss.com/guide-usps-mailbox-regulations/
- https://legalbeagle.com/5506278-rural-mailbox-regulations.html
- https://www.usps.com/manage/mailboxes.htm
- https://about.usps.com/publications/engineering-standards-specifications/spusps-std-7b01/welcome.html
- https://www.diymailboxes.com/mailbox-height-placement/
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