Return to postal informationUSPS Approved Mailboxes Commercial, Apartment & Residential Mailbox Units
U.S. Mail Supply offers USPS Approved & USPS Pre-Approved locking mailboxes with appropriate dimensions and standard features to comply with USPS delivery regulations. We offer locking USPS mailboxes for commercial, apartment, and residential buildings that can comply with USPS standards. Some older mailbox styles we offer, such as the 4B+ compliant 1400 Series 4B+ Horizontal Mailboxes and Vertical Mailboxes are only USPS-approved for replacement purposes. For any mailbox project involving U.S. Postal Service mail delivery, it is important to consult with your local Postmaster before ordering to confirm approval. Most new construction and renovation designs require U.S. Postal Service STD-4C compliant mailbox systems or F-Series outdoor pedestal units.
**Not all mailboxes are USPS Approved for all applications!
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.
What is a USPS Approved Mailbox?
A USPS-approved mailbox is designed according to the standards set by the United States Postal Service (USPS) and is pre-approved for residential or commercial use. The Postmaster General establishes specific criteria that must be met in order for a mailbox to receive USPS Approval, ensuring that manufacturers adhere to quality and safety standards.
The United States Postal Service will only deliver to your mailbox if the unit has been approved by the local Postmaster General. These mailbox units must meet requirements including mailbox height, size, installation location, and compliance with ADA guidelines (Americans with Disabilities Act). USPS-Approved mailboxes include easy installation instructions to ensure you meet all official guidelines. Call our team of experts at US Mail Supply for more information on USPS Compliance and Requirements.
How to Get a USPS Approved Mailbox?
Buying a new mailbox may seem straightforward, but the United States Postal Service enforces regulations and requirements for centralized mailbox units to be met for USPS Approval standards. Many postal customers aren’t aware of these regulations and become confused when their mailbox isn’t approved. Even if your existing commercial mailbox meets the USPS specifications, it is strongly recommended to obtain approval from your local Postmaster when installing a new mailbox system.
To get a USPS delivery mailbox, contact U.S. Mail Supply. Our representatives can supply you with the means of obtaining approval from USPS for your mailboxes. We will also guide you through our selection of USPS-approved mailboxes to find the best mailboxes for your application. We carry USPS-approved STD-4C mailboxes and F-Series cluster boxes for commercial and residential properties.
As of October 5, 2006, all new construction and renovation designs require U.S. Postal Service STD-4C compliant mailbox systems or outdoor pedestal cluster boxes.
Your options for USPS-Approved indoor & outdoor mailbox systems include:
USPS Approved Commercial Cluster Mailbox Units
Commercial mailboxes should be USPS-approved in order to be serviced by the United States Postal Service. U.S. Mail Supply specializes in providing expert personalized service to help contractors, project managers, HOA, and property owners find the perfect mailbox for their property. Shop indoor and outdoor commercial mailboxes for offices, apartment complexes, schools, local businesses, and more.
USPS Approved Residential Mailbox Units
U.S. Mail Supply offers residential and multi-tenant apartment mailboxes including outdoor cluster box units, traditional decorative outdoor mailboxes, and horizontal indoor mailboxes. We offer a wide range of USPS-approved community mailboxes suitable for multi-unit properties. Residential mailboxes are commonly used in neighborhoods, apartment complexes, condominiums, schools and dormitories, and more.
A residential mailbox on a curbside post must meet certain installation restrictions or specifications. All mailboxes must be 41" to 45" above ground level for easy delivery by foot or vehicle. The post must be 6" to 8" from the curb to avoid being a hazard for drivers or pedestrians. A post should go no deeper than 24" into the ground.
Indoor mailboxes come in horizontal and vertical configurations to meet your facility's mail delivery needs. All indoor mailboxes have available locks and keys to protect your correspondence and prevent theft. U.S. Mail Supply even has USPS-approved drop boxes for safe package and parcel delivery.
Buying and installing the right mailbox for your home or business is easy with U.S. Mail Supply. We can guide you to a mailbox that follows USPS specifications and includes easy-to-follow installation instructions to help ensure you meet all official guidelines.
Wall Mounted Residential Mailboxes
Before installing a wall-mounted mailbox in residential areas, check with your local Postmaster to determine the height and position comply with ADA guidelines. Postal carriers must be able to easily reach your mailbox from the sidewalk, your front steps or your porch.
If you choose a mailbox with a lock, only your incoming mail will be secure as it is frowned upon for USPS workers to take your mailbox key. This can limit the parcel size you can receive based on your mail slot size.
Neighborhood Delivery & Collection Box Units and Cluster Mailboxes
Cluster mailboxes (CBUs) and neighborhood delivery and collection box units (NDCBUs) provide easy delivery to multiple residences at once. Since NDCBUs were transitioned out in favor of cluster boxes, there are more rules about their use by the USPS. The factories have discontinued production of all NDCBUs. Please refer to F-Series mailboxes for replacements of NDCBUs.
Cluster mailboxes from U.S. Mail Supply are USPS-approved and include multiple security features. Compartments are reinforced, weather resistant, and accommodate larger parcels than the previous NDCBUs. Please consult your local Postmaster before installation due to specific placement rules.
USPS Mailbox Regulations for Multi-Family Residences
USPS mailbox regulations state community mailboxes installed in all new construction and major renovations of multifamily buildings must meet STD-4C specifications or F-Series cluster boxes. New specifications dictate minimum compartment size, parcel locker ratio, standardized tenant design, ADA compliance and more. U.S. Mail Supply is here to help you find the right replacement mailboxes for your building.
USPS Approved Mailbox STD-4C Specifications
The USPS regulates the types and styles of mailboxes allowed for residential and commercial use to provide a smooth distribution when delivering mail. U.S. Mail Supply offers various USPS-approved mailboxes for homes and businesses. Residential and commercial mailboxes must meet specific USPS requirements, including box size, location, mail slot dimensions (when applicable) and identification information.
Some restrictions and rules may not apply depending on where you live. To find out exactly what is and isn’t approved for use by the USPS, contact your local Postmaster for clarification or visit the official USPS website.
Getting a USPS-approved STD-4C mailbox from U.S. Mail Supply is easy. Fill out our USPS-Approved STD-4C Mailbox Quote Form to get started.
**Not all mailboxes are USPS-approved for all applications! Some older style mailboxes, such as the 4B+ compliant 1400 Series 4B+ Horizontal mailboxes and Vertical mailboxes, are only USPS-approved for replacement purposes. For any mailbox project involving U.S. Postal Service mail delivery, consult the local Postmaster before ordering to confirm approval.**
USPS Postal Regulations & Mailbox Standards
Download official U.S. Postal Service Regulations documents (PDFs) for centralized mailbox requirements and USPS Approval standards:
USPS Guidelines for New Construction Planning and Development
(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.)
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USPS Guidelines for Mailbox Renovations & Remodeling Projects
USPS regulations (Section 632.621) mandate that mailboxes must be updated to meet current approved standards whenever property remodeling or renovation takes place.
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USPS Installation Guide for Cluster Box Unit (CBUs) Accessibility
Refer to Appendix A-D for instructions on the proper installation of Cluster Box Units (CBUs) following accessibility guidelines.
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USPS Standards for Wall-Mounted Centralized Mail Receptacles
U.S. Postal Service National Delivery Planning Standards This Federal Register document was last updated in September 2004. We recommend that you refer to the U.S. Postal Service National Delivery Planning Standards handbook for current documentation.
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USPS Requirements for Parcel Lockers
USPS requires one (1) Parcel Locker for every five (5) Mailboxes. Refer to the two postal publications.
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Find Your Local Postmaster
We recommend that you contact your local Postmaster to review and confirm your centralized mailbox plans.
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