U.S. Mail Supply Categories

USPS Approved Mailboxes

How to Get a USPS Approved Mailbox

Getting a USPS Approved Mailbox

As of October 5, 2006 all new construction and renovation designs REQUIRE U.S. Postal Service STD-4C compliant mailbox systems. More information on STD-4C specifications can be found here:

STD-4C Mailbox Regulations & Specifications

If your existing commercial mailbox meets USPS specifications, you can have it approved by your local postmaster. We carry new USPS approved STD-4C mailboxes or new buildings or businesses who are renovating. USPS approved 4C mailboxes from U.S. Mail Supply are available in a variety of styles, including:

Note: Outdoor 4C pedestal mailboxes are NOT approved by the USPS by default - you'll need to check with your local postmaster for official approval.

Getting a USPS approved STD-4C mailbox from U.S. Mail Supply is easy. Fill out our 4C quote form to get started.

USPS Approved STD-4C Mailbox Quote Form


Buying a USPS Approved Mailbox

Buying a new mailbox might seem easy, however, there are regulations enforced by the United States Postal Service regarding mailbox specifications. Many postal customers aren’t aware of these regulations, then become confused when their mailbox isn’t approved. 

The USPS has to regulate the types and styles of mailboxes allowed for residential and commercial use to prevent delays and accidents when delivering the mail. US Mail Supply offers a wide variety of 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.

Depending on where you live, some of these restrictions and rules may not apply. To find out exactly what is and isn’t approved for use by the USPS, contact your local post office for clarification or visit the official USPS homepage.

Commercial Mailboxes for Sale Commercial Mailboxes

Shop locking USPS approved commercial mailboxes - from post mounted outdoor pedestal mailboxes to large indoor recess wall mounted mailboxes.

Apartment Mailboxes for USPS Delivery Apartment Mailboxes

Check out our full selection of USPS approved apartment mailboxes for sale online from U.S. Mail Supply. Choose indoor horizontal/vertical mailboxes for a lobby or an outdoor cluster box to keep everything outside.

Outdoor Mail Boxes for Sale Outdoor Mailboxes - CBU's

Buy USPS approved curbside outdoor metal standard and decorative CBU's for apartment buildings or any mail collection application.

4C Horizontal Mailboxes for USPS Delivery 4C Horizontal Mailboxes

Wall mounted (recessed) USPS approved 4C horizontal mailboxes are perfect for a lobby or hallway in a multi-family apartment building.

Indoor Commercial Mail Boxes for Sale Online Indoor Mailboxes

Shop modern style or classic horizontal/vertical indoor mailboxes for multi-family apartment buildings.

Commercial Postal Drop Boxes for SalePostal Drop Boxes

Packages and letters are safe in pedestal mounted secure, locking commercial drop boxes and letter lockers available for sale from U.S. Mail Supply.

Contact US Mail Supply by calling 262.782.6510 or 800.571.0147 for more information.
View all 4C horizontal mailboxes available from U.S. Mail Supply.

USPS Mailbox Regulations for Multi Family Residences

USPS mailbox regulations state cluster mailboxes installed in all new construction and major renovations of multifamily buildings must meet STD-4C specifications. New specifications dictate minimum compartment size, parcel locker ratio, standardized tenant design, ADA compliance and more. US Mail Supply is here to help you find the right 4C mailboxes for your building. 

Residential Post Mailboxes

Residential USPS Approved Mail Boxresidential mailbox on a curbside post must meet certain distance restrictions. 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. The posts themselves can be made of wood, steel, or aluminum. A post should go no deeper than 24” into the ground.

These mailboxes can be either traditional, contemporary, or locking. Both traditional and contemporary mailboxes can be made in three different sizes, depending on your needs. The approved sizes reach up to 22.8” x 11” x 15”. Locking mailboxes are allowed more size dimensions due to their security features, though it is always recommended to check with your local post master before installing your own locking mailbox.

Indoor mailboxes can be horizontal, vertical, or custom made to meet your facility needs. All indoor mailboxes have available locks and keys to protect your correspondence and prevent identity theft. US 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 US Mail Supply. All our mailboxes are made to USPS specifications and include easy to follow installation instructions to help ensure you meet all official guidelines.

Wall Mounted Residential Mailboxes

Before installing a wall mounted mailbox to your home, you must check with your local post office to determine the height and position for approval. Postal carriers must be able to easily reach your mailbox from the sidewalk, your front steps or porch.

If you choose a mailbox with a lock, only your incoming mail will be secure as USPS workers are not allowed to take your mailbox key. This can limit the size of parcels you will be able to receive based on your mail slot size.

Neighborhood Delivery & Collection Box Units and Cluster Mailboxes

Cluster mailboxes and neighborhood delivery and collection box units (NDCBU’s) make for easy delivery to multiple residences at once. Since NDCBU’s were transitioned out in favor of cluster boxes, there are more rules about their use by the USPS. New NDCBU’s cannot be purchased or installed unless it is to replace an existing or damaged unit.

Cluster mailboxes from US Mail Supply are USPS approved and include a host of security features. Compartments are reinforced, weather resistant and accommodate larger parcels than the previous NDCBU’s. Please note, your local post office must be consulted before installation due to specific placement rules.

Shop Commercial Mailboxes

Contact US Mail Supply for more information on USPS approved mailboxes.
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