Commercial Mailboxes USPS-Approved Outdoor Pedestals, CBUs and More
Choosing the right commercial mailbox system is essential for secure, efficient mail delivery in offices, schools, apartments, government facilities and business complexes. US Mail Supply offers a diverse selection of USPS-approved commercial mailboxes and private-use options suitable for internal distribution. From outdoor pedestal cluster box units to wall-mounted horizontal systems and parcel lockers, our commercial-grade mailboxes meet postal standards and deliver long-lasting durability. Call our team at 262-782-6510 for more information.
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What Are Commercial Mailboxes?
Commercial mailboxes are centralized, multi-tenant mailbox systems built for high-volume or multi-unit mail delivery. Unlike residential curbside boxes, commercial units are designed to serve multiple tenants at once, making them the preferred option for businesses, apartment complexes, HOAs and institutions. By consolidating delivery into a single secure location, commercial mailboxes save time for postal carriers, improve tenant convenience and enhance overall mail security.
Most commercial mailboxes fall into two categories:
USPS-approvedmailboxes
Must meet strict size, security and accessibility regulations for official postal delivery.
Private-usemailboxes
Designed for centralized distribution within offices, schools or corporate facilities.
Types of Commercial Mailboxes
US Mail Supply carries a wide range of commercial mailbox solutions designed to meet USPS standards or private distribution needs. Each type serves a different application depending on whether the project involves new construction, renovation or internal mail delivery.
Outdoor Pedestal CBUs
The standard for apartments, condos and business parks. Freestanding CBUs provide centralized delivery and meet strict USPS specifications.
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4C Horizontal Mailboxes
Required for new construction and major renovations, wall-mounted or recessed units comply with the USPS STD-4C standard and meet ADA accessibility guidelines.
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4C Depot Mailboxes
Freestanding indoor or outdoor units built for private delivery or centralized distribution in offices, business parks and multi-tenant facilities.
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Private-use Mailboxes
Private-use mailboxes support internal distribution where USPS delivery is not required. Often used in offices, schools and corporate facilities for secure in-house mail handling.
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Parcel Lockers
Designed for secure package delivery. USPS requires one parcel locker for every five mailbox compartments.
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Drop Boxes
Secure receptacles for packages and letters in both USPS-approved and private-use models.
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Secure mailboxes designed for individual businesses or tenants within a commercial property.
Learn MoreVaults & Drop Doxes
Heavy-duty receptacles for bulk mail or packages, available in USPS-approved and private-use models.
Learn MoreUSPS Regulations for Commercial Mailboxes
All commercial mailbox installations must comply with USPS STD-4C or F-Series standards for new construction and major renovations. Older styles, such as 4B+ horizontal and vertical mailboxes, are permitted only in replacement projects.
US Mail Supply helps property managers, contractors and developers navigate USPS mailbox requirements for smooth approval and long-term reliability.
Important: As of October 5, 2006, the USPS requires all new centralized mail delivery systems to use STD-4C-compliant mailboxes or F-Series outdoor cluster box units. USPS standards define minimum compartment sizes, parcel locker requirements, tenant identification and accessibility compliance.
ADA Accessibility
Tenant locks must be no higher than 67 inches, while bottom compartments cannot be lower than 28 inches above the finished floor. Parcel lockers must be at least 15 inches from the floor, and the USPS Arrow lock must be installed between 36–48 inches.
Parcel Locker Ratio
USPS requires a minimum of one parcel locker for every five mailbox compartments.
Postmaster Approval
Every mailbox project should be reviewed and approved by your local Postmaster before installation.
