If you are a Rural Delivery Service customer, we have different mailbox requirements. The height from the ground to the mail slot must be 900mm-1200mm. The regulations for US Postal Service mail box is specified in the Domestic Mail Manual created by the US Postal Service. The dimensions reflect the minimum interior size. I,m thinking about talking to the highway department or maybe just tear the posts out of the ground as theyare illegally placed and unauthorized. The U.S. Postal Service has issued mailbox regulations regarding residential mailboxes. I still don’t understand y my mail box should be 42 to 46 in height.
Among these regulations is the mailbox height, which has been set with the carrier’s safety and ease of delivery in mind. These posts or poles must be set into the ground so that when the mailbox is attached, the inside floor of the box is 41 to 45 inches above the ground. Standard In-Ground Post 5105B, accessory features heavy-duty construction of 4 in. Refer to the mounting instructions that come with the chosen mailbox for USPS guidelines on mounting height. Generally, shorter traditional style mailboxes need a longer in-ground post, and taller mailboxes require a shorter in-ground post to adhere to USPS mounting requirements.
The included, standard ground post extension is designed to place the bottom of the mailbox at the desired height (42-46 inches) above the road surface. Check with your local postmaster for the proper height of your box and the distance it should be from the street. Once you have selected the location for your new mailbox, begin by cutting a 12 inch square section of ground, saving the sod. Installing, repairing or replacing your own mailbox post can be a chore but these hints should help you understand the types of posts available as well as installation methods. Nail or screw a piece of 2×4 or larger lumber to the post at or within a few inches of ground level. Vertical height from road surface to bottom of mailbox: Between 41 and 45.
Mailbox Height Regulations
Generally, mailboxes are installed at a height of 41-45 in. from the road surface to inside floor of mailbox and are set back 6-8 in. The post is designed for in-ground installation with a 4×4 wood post (sold separately).