The United States Postal Service (USPS) has some certain rules for residential mailboxes. Your mailbox should comply with several rules and regulations. Mailbox standardization helps ensure the security of mail carriers and their delivery items—specifications for locking, packing, or mounting mailboxes on the wall.
General Rules of USPS for Curbside Residential Mailboxes
- All mailboxes must meet the internal and external dimensions requirements of the USPS.
- Curbside mailboxes should be installed facing the road so that the postmen can deliver the mail sitting in their vehicle.
- The box or house number on the mailbox must be represented in at least 2.5 cm high. Numbers must be placed visibly on the front or side of the flag of the box.
- Mailboxes must be placed 15 to 20 cm from the side of the road; received mail slots or doors must be 104 to 114 cm from the floor.
- Post-mounted curbside mailbox post must be buried no more than 61 cm deep; posts made of wood should not be more than 10 cm high and 11 cm wide. Steel or aluminum pipes, 5 cm in diameter, is also acceptable.
- Newspaper sockets can be installed on the same post, but cannot be directly linked to the mailbox or compatible with it.
USPS Rules for Locking Residential MailboxesLockable mailboxes (link on this site) effectively prevent theft or breach of mails. The USPS requires them to meet the same regulations as standard mailboxes. The regulations for locking mailboxes are as follows.
- Slots receiving messages must be at least 4.5 cm high x 25.5 cm wide.
- It should be easily accessible for the postman to put the mail in the locking mailbox.
- The mailbox slot should be large enough to accommodate the normal daily mail volume of the resident.
- Slots must also be large enough to accommodate the deployment of our priority envelope.
- Locks cannot be used in contemporary or traditional mailbox designs.
- USPS operators do not open mailbox locks and do not keep mailbox keys.
USPS Regulations for Parcel MailboxesParcel mailboxes are sometimes called large rural mailboxes, package mailboxes, or T3 mailboxes. Regulations for parcel mailboxes are almost the same as the standard mailboxes. The advantage of parcel mailbox is it can receive large items.
- Approved parcel mailboxes are no more than 57 cm long, 21 cm wide and 30 cm high.
USPS Rules for Wall Mount Mailbox InstallationWall-mounted mailboxes (link on this site) are useful in areas where postal carriers walk. They are also useful for residents with physical disabilities.
- USPS does not have specific size requirements for wall installation of mailboxes, but local rules may apply.
- Customers should consult local postal managers or mail carriers before installing a wall-mounted mailbox to ensure proper placement and uninterrupted mail delivery.
- The flap on the wall-mounted mailbox should work smoothly and reliably.
- Mail operators must have secure and unhindered access to mailboxes.