US Postal Service Mail Box – Regulation Mailboxes
A regulation US Postal Service mail box is specified in the Domestic Mail Manual created by the US Postal Service. Regulation US Postal Service mailboxes can be purchased online from many different retailers.
Before purchasing your mailbox online, make sure it is US postal approved. Curbside mailboxes are available in three sizes: -
- Small T1 (C1) size is approximately 5 inches wide by 6 inches tall and 18 ½ inches long.
- Medium T2 (C2) size is approximately 6 inches wide by 7 inches tall by 19 inches long.
- Large T3 (C3) size is approximately 8 inches wide by 11 ½ inches tall by 22 ½ inches long.
The “T” stands for Traditional and the “C” stands for Contemporary. The dimensions reflect the minimum interior size.
Post mount boxes should be positioned 6-8 inches from the curb and approximately 42-46 inches high measured from the lawn to the top of the installed mailbox, not the top of the post. If the post has a vertical arm, the arm should not extend any closer than 6 inches from the curb.
When installing your new set, make sure your set complies with these regulations. Be cautious when building your own mail box and post. Approximately 100 motorists are killed yearly in collisions with mailboxes. Some posts are mounted in concrete or constructed of indestructible materials. In a collision, a motor vehicle can be severely damaged and its occupants injured or killed.
The U.S. Postal Service does not govern wall mount boxes, however, you should notify your local mail carrier before installation to ensure proper placement of the mailbox and check for any local codes or regulations governing placement of the box. The product should operate easily and nothing should obstruct the opening and closing of the lid. Also check with your home owners association to see if they have any association by-laws which you need to comply with.