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Private Commercial Mailboxes


More Info About Private Commercial Mailboxes

Salsbury Industries carries a complete line of commercial mailboxes for private distribution. Choose from this group of products when a private individual (non-U.S.P.S. employee) will be delivering the mail. On front loading mailboxes, your order will include a factory-installed master commercial lock that allows access to the unit through one master door opening.

Commercial mailboxes for private distribution are designed for multi-tenant applications and are available in aluminum style, 4C horizontal mailboxes, freestanding units, and a variety of other products. These products are commonly used in colleges, universities, private postal centers, commercial buildings, government agencies, military bases, and other applications.

Different Types of Salsbury Private Commercial Mailboxes

Private commercial mailboxes come in various sizes and shapes and can be freestanding or wall mounted, placed outside or in a lobby or other enclosure. Whatever your business demands, we've got a commercial mailbox that will blend in seamlessly with your operation.

Please review the options for private commercial mailboxes below and contact us for a quote or call for more information.


4C Horizontal Mailboxes

Salsbury 4C horizontal mailboxes are made of heavy-duty aluminum, are U.S.P.S approved, and are available as front or rear loading units. All 4C horizontal mailboxes meet the specifications of USPS-STD-4C.

  • 4C Recessed Mounted Mailboxes
  • 4C Surface Mounted Mailboxes
  • 4C Freestanding Mailboxes
  • 4C Custom Horizontal Mailboxes
  • 4C Horizontal Parcel Locker

Horizontal mailboxes come in four colors: aluminum, bronze, sandstone, and black. Custom colors are available as an option. Find more detailed information on all our customized options, including size, and we have design assistance if needed.


Aluminum Style Mailboxes

Aluminum mailboxes perform well under a wide variety of weather conditions, provide excellent security, and can withstand years of usage. Options for aluminum mailboxes include:


Free-standing Mailboxes

Free-standing mailboxes are an excellent choice for your commercial business. Freestanding mailboxes have solid, dependable features, including security and privacy. Free-standing mailboxes are used in dormitories, senior living communities, office parks, and other commercial campuses. Free-standing mailboxes can be installed indoors or out and many units can be customized. Our selection includes:

Specialty Products

Salsbury Industries offers additional products for commercial mailboxes that deliver convenience and security for business owners and clients. Our line of specialty products includes:

Parcel lockers, pedestals, and letter boxes are available in color options to match your choice of a mailbox. Name directories are available in aluminum and bronze finish. Lobby directories are available in black. Contact our team to help choose the right specialty product for your mailbox.

Replacement Locks

You may need to replace a lock or key on a commercial mailbox. We've got you covered and offer a variety of replacement locks, including key and single dial combination locks. A representative can help you find the right replacement.

Private Commercial Mailboxes for Buildings

Business owners expect their mail and clients' mail to be delivered and stored in a secure private mailbox. There are multiple options to choose from, and your type of business and location may play a part in which style of private commercial mailbox you choose.

Horizontal mailboxes are an excellent choice for various businesses and commercial properties. Our line is built with durable aluminum and comes in wall mounted, recessed mounted or free-standing units. Features include larger parcel lockers and custom options.

Private Commercial Mailboxes for Colleges

The mail area for colleges and universities is always a busy hub for students checking for mail and packages from family. Top choices for private commercial mailboxes for colleges include horizontal mailboxes. The horizontal mailbox system offers the most extensive array of configurations, private access, and different widths.


Private Commercial Mailboxes for Private Postal Centers

Choosing a commercial mailbox for a private postal center will depend on several factors - if the business is large or small, security needs, and the volume of packages and mail to be distributed. 

Our mailbox configurator can help in determining your needs and requirements.

Custom Private Commercial Mailboxes

Sometimes the best option for a private commercial mailbox system may be custom. The 4C custom horizontal mailboxes can be used in various settings and come in front and rear loading options. These units are constructed of heavy-duty aluminum and stainless-steel hardware. Choose standard colors or for more customization, pick a color that matches your interior or exterior. Use our mailbox configurator to narrow down possibilities. Contact our team for help with your custom order.

Questions about Private Commercial Mailboxes? Contact Us Today

There are many possibilities in private commercial mailboxes for your business or college campus. At Salsbury Mailboxes, we have helpful tools to get you started.

Our mailbox configurator can help narrow down the number of mailboxes needed and other requirements. We also have extensive information on A.D.A. accessibility guidelines for commercial mailboxes and an entire resource library filled with helpful information.

But, sometimes, nothing compares to talking to a person who is highly knowledgeable in commercial mailboxes. We invite you to call us or try our live chat feature. We look forward to helping you choose the best private commercial mailbox for your business needs.

FAQ Categories

Questions & Answers

General Questions

Why purchase from Salsbury Industries?

Established in 1936, Salsbury Industries is the industry leader in manufacturing and distributing commercial and residential mailboxes. Our warehouses are filled with inventory and most standard orders ship within 1 to 2 days from the time the order is received. Whether you are building a mail center or buying a single mailbox for your home, Salsbury Industries is your one-stop source. Thank you for visiting us at mailboxes.com.

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Can you mail me a free catalog?

Certainly. Click here to Request a free catalog.

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Can you provide a free quotation?

Absolutely. For volume purchases, click here to Request a free quotation.

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What is ISO 9001:2015?

ISO 9001:2015 is an internationally agreed upon standard that describes a system by which a company can demonstrate their commitment to product quality in all of their activities. Quality must be built into a product by the use of a management system that assures all activities associated with product quality are appropriately managed and controlled. If a company successfully completes an audit by an ISO-accredited third party auditing company, then ISO 9001:2015 certification is awarded. Salsbury Industries is an ISO 9001:2015 certified company.

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How do I find products?

Use our Search. It is on the top right of every web page - just enter an item name, a keyword or an item number from a Salsbury Industries catalog and click the red Search button. You can also find products by selecting one of our major categories 'Commercial Mailboxes' for USPS Access, ‘Commercial Mailboxes’ for Private Access, 'Residential Mailboxes' and 'Signage'.

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What is the difference between products for U.S. Postal Service Access and products for Private Access?

USPS Delivery - Choose from this group of products when the U.S. POSTAL SERVICE will be delivering the mail.  Your local postmaster will visit your site and install a master postal lock (when applicable) that allows access to the unit by a U.S. Postal Service employee through one master door opening.


Private Delivery - Choose from this group of products when a PRIVATE individual (non-USPS employee) will be delivering the mail.  Your order will include a factory installed master commercial lock (when applicable) that allows access to the unit through one master door opening.  

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What is Standard USPS-STD-4B+?

The demand for improved mailbox security prompted the United States Postal Service to develop this standard. This standard requires manufacturers to strengthen and improve the master door (arrow lock compartment) on vertical style apartment house mail receptacles (3500 series) and horizontal style apartment house mail receptacles (3600 series). All Salsbury Industries 3500 and 3600 series mailboxes are USPS approved and in full compliance with the requirements of USPS-STD-4B . These 4B vertical and 4B horizontal mailboxes are approved for replacement and/or retrofit installations effective October 2006. For new construction or major remodels, 4C horizontal mailboxes (3700 series) are required.

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What is Standard USPS-STD-4C?

The United States Postal Service addressed the shape of mailbox compartments and the demand for more secure mail and parcel delivery with a new standard, USPS-STD-4C. This standard replaces the traditional cube style compartments with more flat style compartments as well as incorporates fully integrated or stand-alone parcel locker options into the mailbox. A minimum of one parcel locker is required for every ten (10) tenant compartments. Parcel lockers are not required in installation sites with less than ten (10) tenant compartments. Salsbury Industries 3700 series 4C standard and custom high security horizontal mailboxes and fully integrated and stand-alone parcel lockers have been USPS approved and meet the specifications of USPS-STD-4C. This standard requires that 4C horizontal mailboxes and parcel lockers be installed in all new construction projects and major remodels effective October 2006.

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How do I order on-line?

Just start shopping! When you find something you like, click the ADD TO CART button next to that item. It will be saved in your Shopping Cart until you are ready to check out. You will have plenty of time to review and change your order before you submit it. When you check out, you will have the opportunity to register which will create a mailboxes.com account or you can use our simple 'Guest Checkout' procedure for a one time transaction. Either way, your personal information and transactions are secure.

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Is it safe to use my credit card information on the website?

Absolutely. All information you transmit to Salsbury Industries is protected with the most advanced security measures available. Or if you prefer, you can browse our on-line catalog and make your selections, then simply phone your order to 1-800-624-5269 or fax it to 1-800-624-5299 or mail it to 18300 Central Ave, Carson, CA 90746.

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What credit cards does Salsbury Industries accept?

We accept Visa, MasterCard, American Express and Discover.
4 Credit Cards

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Does Salsbury Industries accept PayPal?

We accept PayPal as a method of payment for web orders only.
PayPal logo

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Does Salsbury Industries charge sales tax?

Sales tax is applied to orders shipped to California addresses only.

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Does Salsbury Industries ship internationally?

Yes, we welcome international orders.

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What are the benefits of membership at Mailboxes.com?

Registering takes only minutes and is absolutely free. The benefits of membership are plentiful and include quick and efficient check out, on-line order tracking, order status and history, your personalized address book and information on exciting news and specials at Salsbury Industries. Register today - you will be glad you did. Click here to register.

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Cluster Mailbox

What is a Cluster Box Unit?

A cluster mailbox or cluster box unit (CBU) is a free-standing, pedestal mailbox with 4, 8, 12, 13 or 16 individually locked mailbox compartments and up to 2 integrated parcel lockers approved by the U.S. Postal Service.

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What are Standard USPS Cluster Box Units?

The Salsbury Standard Cluster Mailbox and Regency® Decorative CBU Type I, Type II, Type III, Type IV, Type V, Type VI and Outdoor Parcel Lockers (OPL's) are all licensed and approved by the U. S. Postal Service. Ideal for commercial buildings, multi-family housing units, apartment complexes, government and military bases, schools, colleges and other residential and commercial developments, cluster mailboxes are ultra-durable and provide a secure means of receiving mail and packages. When you install your Cluster Mailbox the local post office will install an "Arrow Lock." This lock is used for the local post master to open the unit and deliver the mail. When the U.S. Postal Service delivers a package to the parcel locker, a parcel locker key is placed in the recipient's mailbox. Once the recipient opens the parcel locker, the key is automatically retained in the lock until it is removed with the USPS control key.


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What is the difference between Cluster Box Units for U.S. Postal Service Access and products for Private Access?

USPS Delivery - Choose from this group of products when the U.S. POSTAL SERVICE will be delivering the mail.  Your local postmaster will visit your site and install a master postal lock (when applicable) that allows access to the unit by a U.S. Postal Service employee through one master door opening.


Private Delivery - Choose from this group of products when a PRIVATE individual (non-USPS employee) will be delivering the mail.  Your order will include a factory installed master commercial lock (when applicable) that allows access to the unit through one master door opening.  

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How do Cluster Mailboxes work?

In general, all cluster mailboxes work the same way. The carrier has a master key that opens the back of the unit or all the compartments at once. After placing the mail in the proper compartment, the carrier locks the CBU up and individual box users access their particular box with a key.

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Who is responsible for Cluster Mailboxes?

The Postal Service is responsible for providing every customer a compartment lock and three (3) keys to his or her postal-owned Cluster Box Unit (CBU).  No key deposits are required and customers may duplicate their keys at no expense to the Postal Service.  The Postal Service keeps no duplicate keys and if the customer loses all the keys, the Postal Service will have to install a new lock and issue a new set of keys at the customer's expense.

If the mailbox is for a house, condo, apartment or other physical residence, customers make arrangements to pick up the mailbox key(s) from the owner, manager or prior resident when they move in.  The builder or property owner is responsible for providing lock and key service for privately owned cluster mailboxes.


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Can you provide a free quotation for Cluster Box Units?

Absolutely. For volume purchases of Cluster Mailboxes, click here to Request a free quotation.

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What colors do CBU mailboxes come in?

Salsbury's CBU mailboxes feature a durable powder coated finish available in sandstone, bronze, green, black, white and gray (for replacement units only).

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4C Mailbox

What is a 4C Horizontal Mailbox?

Salsbury Industries manufactures USPS STD-4C Horizontal mailboxes that are required for new construction and major renovations. Salsbury 4C Horizontal Mailboxes must be installed according to postal regulations, found here:


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Test question for 4C mailboxes