USPS Mailbox Regulations

Installing A Mailbox Post 

The best mailbox supports are stable but bend or fall away if a car hits them. The Federal Highway Administration recommends:

• A 4″ x 4″ wooden support or a 2″-diameter standard steel or aluminum pipe.
• Avoid unyielding and potentially dangerous supports, like heavy metal pipes, concrete posts, and farm equipment (e.g., milk cans filled with concrete).
• Bury your post no more than 24″ deep