USPS Approved Mailboxes

Cluster Mailboxes

4B+ Horizontal Mailboxes

4C Horizontal Mailboxes

Vertical Mailboxes

Locking Residential Mailboxes

All Approved Mailboxes

Shop USPS Approved Mailboxes

USPS Approved Style

Mailboxes

Subject to local regulations and installation requirements, this product line has models that can comply with USPS standards, as defined by the Postmaster General.

Please note that the USPS periodically updates mailbox standards and guidelines. Before proceeding with mailbox projects, we recommend you consult with your local Postmaster to comply with your specific area guidelines. US Mail Supply experts are standing by to help you navigate the product selection and installation process.

USPS Pre-Approved

Mailboxes

Subject to local regulations and installation requirements, this product has been specifically approved by the Postmaster General.

Please note that the USPS periodically updates mailbox standards and guidelines. Before proceeding with mailbox projects, we recommend you consult with your local Postmaster to comply with your specific area guidelines. US Mail Supply experts are standing by to help you navigate the product selection and installation process.

U.S. Mail Supply cannot grant USPS Approval for mailboxes. Please contact your local U.S. Postal Office to obtain USPS Approval for your mailbox before purchasing.

Why USPS Approval is Non-Negotiable

The USPS will not deliver mail to a mailbox that doesn’t meet its established standards. Installing a non-compliant unit can result in a disruption of your mail service and could require you to purchase and install a new, approved mailbox at your own expense. Approval ensures the mailbox is secure, accessible for mail carriers, and built to last.

Types of USPS Approved Mailboxes for Every Application

USPS approval isn’t one-size-fits-all. The requirements vary based on the application. Here’s a breakdown of the main categories.

USPS Approved Commercial Mailboxes (4C & CBU)

For any new commercial or multi-family construction, the USPS approved commercial mailbox standard is the STD-4C. These modern, centralized units are required for apartment buildings, office complexes, and condo communities. They feature larger compartments and often include integrated parcel lockers to handle package deliveries. When installed outdoors on a pedestal, they are referred to as Cluster Box Units (CBUs).

USPS Approved Mailboxes for Apartments

If you are a property manager or developer, USPS approved mailboxes for apartments fall under the same 4C regulations. These systems provide secure, centralized mail and package delivery for all tenants, enhancing property security and meeting all modern postal standards. US Mail Supply strongly recommends obtaining approval from your local Postmaster on ALL 4C Mailbox installations prior to purchase!

USPS Approved Residential Mailboxes

For single-family homes, the rules are different. USPS approved residential mailboxes include traditional curbside models and wall-mounted options. While they don’t need to be a specific model, they must still meet general USPS criteria for size, strength, and installation. For example, a curbside mailbox must be installed at a height of 41″ to 45″ and set 6″ to 8″ back from the curb.

USPS Approved Lockable Mailboxes

Mail theft is on the rise, which has made USPS approved lockable mailboxes a very popular option. You can find locking options in both residential curbside styles and, more commonly, in commercial 4C and CBU systems. These mailboxes have a secure incoming slot for the carrier and a locked access door for the recipient, providing maximum protection against mail theft.

Why Trust US Mail Supply for USPS Compliance?

Navigating USPS regulations can be overwhelming. At US Mail Supply, we make it simple. We are experts in postal compliance and can refer you to products that are fully approved for their intended use. When you shop with us, you can be confident that you are getting a mailbox that will be serviced by the USPS without any issues. Our team is here to provide expert support for your specific project as well as guidance to obtain all necessary local approvals.

Frequently Asked Questions About USPS Approved Mailboxes

• What happens if I install a mailbox that is not USPS approved?
  There is a chance USPS will not deliver mail to a non-compliant mailbox. Your local postmaster will leave a notice, and mail service will be suspended until you install an approved unit.
• Can I replace my old 4B commercial mailbox with a new 4C model?
  Yes. In fact, for any major renovation or replacement, the USPS requires you to update to the new STD-4C standard. The 4B models are generally no longer approved for new installations.
• Do I still need to contact my local Postmaster before installing a new mailbox?
  Yes, it is always a best practice. For commercial projects, it’s essential. For residential replacements, a quick call can confirm placement and ensure there are no local restrictions you’re unaware of.
• Are locking mailboxes automatically USPS approved?
  Not necessarily. A locking mailbox must still meet all USPS size, construction, and installation standards to be approved. If the USPS Master Lock (or Arrow Lock) is required, Postmaster approval is ALWAYS required.
• What are the installation rules for a USPS approved wall mount mailbox?
  While there are no universal height rules for wall-mounted boxes like there are for curbside units, they must be placed in a location that is easily and safely accessible for your mail carrier without obstruction. It’s best to confirm placement with your local post office.