Mailbox Post Distance from the Curb: The 6–8″ USPS Rule Explained

Installing your mailbox post in the right spot helps ensure safe, easy, and reliable mail delivery. One of the most common questions homeowners have is how close to the curb their mailbox should be placed.

The USPS 6–8 Inch Rule

For a curbside mailbox, the front of the box should generally sit 6 to 8 inches back from the curb or edge of the road. This distance allows the mail carrier to reach the mailbox directly from their delivery vehicle without getting out or driving too close to the curb.

How to Measure the Distance

Measure horizontally from the curb or road edge to the front face of the mailbox—not to the post itself. The mailbox should also be positioned so that the mail carrier can safely and easily access it from their vehicle.

Common Installation Mistakes

• Placing the mailbox too close to the curb, where it could be hit by passing vehicles or snowplows.

• Installing it too far back, making it difficult for the carrier to reach.

• Measuring to the post instead of measuring to the front door/face of the mailbox.

• Setting the post at an unsafe height or in a location that blocks access.

Confirm Local Guidelines Before Installing

While the 6–8 inch rule is a standard baseline, your local post office, municipality, HOA, or road authorities may have additional requirements. Before permanently setting your post, contact your local post office to confirm the approved location, height, and placement for your specific street.

With proper measurements and a sturdy installation, your mailbox will look great while providing your mail carrier with a safe and convenient delivery spot.