Local: 262-782-6510 Toll Free: 800-571-0147
USPS Compliance FAQs Request a Quote Contact
Shopping Cart EMPTY
◄ Return to postal information

8 USPS Approved Mailbox Types for Commercial & Residential Use

U.S. Mail Supply offers USPS-approved mailboxes suitable for indoor and outdoor delivery. Our reputable products can be found in thousands of communities and commercial businesses across the US. Since October 2006, all new construction and renovation designs, including residential plans, require USPS STD-4C compliance. To satisfy these regulations, box size, location, mail slot dimensions and identification information are all considered in the design of these mailboxes. U.S. Mail Supply makes selecting a mailbox easier by offering already approved units. With so many styles and options to choose from, we can help find one that works best for you.

1. Cluster Mailboxes

Cluster Box Units (CBUs)are the standard and most commonly used unit for all multi-family mail delivery. CBUs stand upright as a single, pedestal configuration and feature numerous boxes for use in apartments and condominiums. CBUs are the most popular option for neighborhoods and communities seeking centralized mail delivery but are also suitable for commercial use. To fit the individual needs of a property, cluster mailboxes feature:

Depending on the style, a cluster mailbox may include parcel lockers for packages too large to fit in individual slots. They also come in a variety of color options to blend seamlessly into any property.

Unlike roadside mailboxes, every unit offers individual key locks to ensure security. Made of powder-coated stainless steel and aluminum, each CPU is built to withstand harsh weather conditions and prevent corrosion.

2. Wall Mounted Horizontal Mailboxes

As of 2006, all new construction, mailbox applications and major renovation sites using centralized wall-mounted USPS mail delivery are required to have a 4C mailbox system.

4C horizontal mailboxes are best described as practical, efficient and simple. They are ideal for colleges, hotels, financial institutions, K-12 schools, hospitals, multi-family complexes, military bases, etc.

They can be installed to be recess or surface mounted onto any stable wall. The 4C mailboxes may be ordered in various heights for ultimate versatility.

Wall mounted mailboxes features include:

3. Front Loading Horizontal Mailboxes

The 1400 series 4B+ front loading mailboxes are USPS approved for replacement purposes only in apartment complexes, universities and military housing. Units feature a front-loading mechanism suitable for indoor use. The mailbox system is recess mounted and built to order, making it completely customizable upon request. Installation is quick and easy since the unit comes completely assembled.

Front loading horizontal mailboxes features include:

4. Vertical Mailboxes

The 3500 4B+ vertical mailbox series is USPS approved for indoor replacement and retrofit purposes only. They are most commonly used as a mail delivery solution in small, multi-family buildings, apartments, condos, office buildings and any location with a USPS mail distribution center. The unit may be surface or recess mounted.

These vertical mailboxes are designed to meet USPS STD-4B+ specifications, which requires the series to have stronger compartment locks and master doors. By design, the 3500 series prohibits the most common methods of tampering, placing security at the forefront. This means all private documents and packages are well protected.

Vertical mailbox features include:

5. Locking Residential Pedestal Mailboxes

Locking residential pedestal mailboxes combine security and durability at a low price for curb-side delivery to homes and small business. Each unit is designed to be resistant to snow, summer sun, seasonal storms and varying temperatures. Four tenant lock options are available depending on security needs.

Locking residential mailbox features by security level:

  1. USPS approved 5-pin tumbler lock with a 7 gauge stainless steel “hook” cam on a single-layer 14 gauge steel door (standard & included in price)
  2. Medeco deadbolt lock with upgraded 10 gauge steel door
  3. USPS approved 5-pin tumbler lock with 10 gauge stainless steel cam. Includes “Claw” Locking Mechanism. Doors are heavy-duty with two 14 gauge steel plates pressed together.
  4. Medeco deadbolt lock, 10 gauge stainless steel “claw” locking mechanism. Doors are made with two 15 gauge steel plates pressed together.

Standard versions of locking mailboxes can hold about 2 weeks of mail for those away from home for extended periods of time. You can also choose from a variety of color options to match the aesthetics of your property. These mailboxes tend to be constructed of galvanized steel, making them extremely weather resistant. Other versions of locking mailboxes are catered to small businesses who need security for incoming and outgoing mail.

6. Mail Package Drop Box

USPS-approved 4300 series mail package drops are ideal for homes, schools, apartments, office buildings, and small businesses with high levels of incoming and outgoing mail. Mail package drops may also be used for non-postal package delivery or other private applications. Package drops allow more space and security than a traditional mailbox, with locks on both front and rear access doors. Units can be mounted on an optional surface mount post or an in-ground pedestal that can be ordered in coordinating colors.

Package drop box features include:

7. Letter Drop Boxes

Letter drop boxes offer compact, space-saving solutions for commercial mail collection. They are commonly used in apartments, condos, and offices. To blend seamlessly into any environment, these letter boxes can be surface or recess mounted to walls. Units are designed for indoor use but may be used outdoors if sheltered. All drop boxes are affordable and easy to install.

Letter drop box features include:

8. Delivery Vault Drop Box

The USPS-approved vault drop box features an extra-large drop for packages and a smaller drop for letters. Vault drop boxes offer convenience for residential and commercial purposes. The design caters to high volumes of mail for those who are unable to collect mail frequently. The unit typically holds 2 or more weeks of mail depending on package and letter size. They feature a favorable, user-friendly design that allows for ultimate versatility.

Delivery vaults offer locked letterbox and package slots to prevent prying and theft. Enclosed, outgoing mail slots shield mail from inclement weather. With a variety of colors to choose from, it can fit the aesthetics of any property.

USPS Approved Mailboxes Types from U.S. Mail Supply

U.S. Mail Supply offers all these mailbox types and more for USPS-approved delivery. We have the expertise and experience to guide you toward the perfect mailbox selection. Select a mailbox best suited for your commercial or residential application.

Built right. Priced right. Shop all USPS approved mailboxes online from U.S. Mail Supply.

Commercial USPS delivery & private delivery Shop indoor and outdoor mailboxes for apartment complexes, condos, offices, colleges, or local businesses. Choose high end vintage style large cluster mailboxes or simple small indoor lockable horizontal mailboxes for a lobby area or entryway. Indoor Invest in quality Our inventory features horizontal and vertical indoor metal mailboxes for commercial buildings and businesses. Equip a small apartment complex or an entire university with secure storage for mail, internal documents or packages - USPS approved or private use options available. Mailroom Totes, shelves, sorters, and more We supply professional mailroom supplies and equipment for commercial and municipal buildings. Choose from our wide selection of mailroom totes, sorters, shelves, carts, and more. 4C Horizontal USPS 4C horizontal & 4C depot style boxes We supply Florence 4C horizontal and 4C depot style mailboxes for commercial and municipal buildings for a highly secure option. Horizontal 4C mailboxes are USPS approved (STD-4C) and 4C depot style mailboxes are for private deliveries only.
USPS Approved Commercial, Apartment, & Residential Units The U.S. Postal Service will only deliver to your mailbox if it's up to their standards - including box size, location, slot dimensions and identification info. Our USPS approved mail boxes include easy installation instructions to ensure you meet all official guidelines. Residential Quality one-time purchase Cheap home mailboxes are flimsy and put your belongings at risk. For single-house rentals or individual home owners, a metal mailbox poses the best security and defense. Choose a wall mounted mail house or traditional locking box with post. Outdoor Apartments, schools, or businesses Outdoor metal mailboxes with secure locking options protect possessions from theft and harsh weather. Choose decorative or standard cluster box units or locking residential mailboxes (USPS approved or for private use only). Drop Boxes Parcel & package receptacles Florence drop boxes for parcels, packages, and mail are always sturdy and secure. Your packages and letters will be kept safe until your mailman arrives to collect the contents.
Make sure to choose the RIGHT mailbox.

Don't worry, we can help you figure out what's best and most cost efficient for your space. A representative at U.S. Mail Supply will help you figure out what is required for USPS or private delivery, the number of units you need and any information required for installation.

Request a Quote