Mailbox Installation Guide

Here is a helpful guide to follow for your mailbox installation:

  • Position your mailbox 41″ to 45″ from the road surface to the bottom of the mailbox or point of mail entry.
  • Place your mailbox 6″ to 8″ back from the curb. If you do not have a raised curb, contact your local postmaster for guidance.
  • Put your house or apartment number on the mailbox.
  • If your mailbox is on a different street from your house or apartment, put your full street address on the box.
  • If you are attaching the box to your house, make sure the postal carrier can reach it easily from your sidewalk, steps, or porch.

Installing the 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.

Door Slots

Approved Door Slots

Some homes and apartments have a slot in the door for receiving mail rather than a mailbox. The standards for an approved door slot are:

  • The opening must be at least 1 1/2″ x 7″.
  • The bottom of the slot must be at least 30″ above floor.
  • Horizontal slots must have a flap hinged at the top.
  • Vertical slots must be hinged on the opposite side from the door’s hinges.

Inside Door Slot Hoods

The standards for approved inside door slot hoods are:

  • The hood should not project more than 2 1/16″ beyond the inside of the door.
  • On a horizontal slot, the hood should not extend below the bottom of the outside plate.
  • On a vertical slot, the hood should not extend beyond the side of the outside plate on same side as the door’s hinges.


Mailboxes take a beating from the weather, so we recommend an annual mailbox checkup to avoid damage to your mail or difficulty identifying your address.

  • Tighten loose hinges on the door
  • Take care of rusty or loose parts
  • Replace missing or faded house numbers
  • Keep the path to your mailbox clear

The above information was gathered from the official site of the USPS.

For a worry free Mailbox Installation have a professional install your mailbox.

USPS mailbox installation guidelines