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Commercial Mailboxes

Commercial Mailboxes

Choosing the right Commercial Mailbox

We sell commercial mailboxes designed for a variety of applications, including schools, hospital facilities, nursing homes, hotels, residential developments, apartment complexes, and more. The Cluster Box Unit (CBU) "takes the cake" as our most popular commercial mailbox designed for centralized outdoor mail delivery for multiple tenants. Below you'll find a detailed overview of our top commercial mailbox categories:

Cluster Mailboxes (CBUs)

Auth Florence and Salsbury Industries, the two leading commercial brands in the U.S., make USPS approved CBUs in 8-Door, 12-Door, 13-Door, and 16-Door configurations and in four architectural colors (you can also purchase Salsbury CBUs in Green and White, in addition to the four traditional colors). All units include a matching pedestal for installation.

Cluster Mailboxes Sandstone Cluster Mailboxes Bronze Cluster Mailboxes Gray Cluster Mailboxes Black

Vertical Mailboxes

Vertical Mailboxes are part of the USPS 4B specification. In layman's terms, this means that customers typically only purchase them to replace existing units. You can purchase the vertical as either a surface mounted (on the wall) or recessed mounted unit (in the wall). They come in 3-Door, 4-Door, 5-Door, 6-Door, and 7-Door configurations. Like CBUs, the two mailbox brands we carry in this category are Auth Florence and Salsbury. Both are quality mailbox brands, so the selection is usually a matter of price and preference. You can also purchase private delivery units (for in-house mail distribution) if you do not need the USPS to deliver.

3 Door Vertical Mailbox Gray - Surface Mount 3 Door Vertical Mailbox Gold - Recessed Mount 3 Door Vertical Mailbox Bronze - Surface Mount 3 Door Vertical Mailbox Sandstone - Recessed Mount

4C Horizontal Mailboxes

The 4C Horizontal is the industry standard for recessed mounted centralized delivery. Unlike the CBU, the 4C unit is usually recessed in a wall, indoors or outdoors, or in a kiosk (typically outdoors). However, you can purchase the 4C with a surface mount collar or free-standing kiosk if you do not intend to install the units into a wall. These can be purchased with or without parcel lockers for package delivery, and can be selected for either USPS or private delivery. Available in a variety of door configurations and architectural colors, the 4C mailbox is an ideal solution for apartment complexes and commercial buildings.

Front Loading 4C Horizontal Mailbox 20 Doors and 2 Parcel Lockers - Aluminum Rear Loading 4C Mailbox Maximum Door Height Front Loading 4C Mailbox Maximum Height Sandstone Rear Loading 4C Mailbox Maximum Door Height Gold

4B Horizontal Mailboxes

The predecessor of the 4C unit, customers typically purchase 4B mailboxes to replace existing 4B applications. Prior to purchasing new 4Bs to replace older units, we recommend you contact your local post office for approval. Since the post office will need to approve the application before it's installed, this extra precaution can save time and money. Typically, 4Cs will need to replace 4Bs when the wall opening (for housing the recessed units) is modified. For new construction, customers should purchase 4C mailboxes or Cluster Box Units to meet US Postal specifications.

Specialty Units

Sometimes customers require more specialized mail delivery products. Our selection of specialty mailboxes includes Salsbury Courier Boxes, Letter Drops, Door and Wall Mail Slots, as well as a variety of centralized mail units for private use (universities, etc.). If you cannot find the mailbox you are looking for, or if you would like more information regarding one of these products, please give us a call at (866) 707-0008 or open up our chat window (bottom left of the site) to speak with one of our customer care reps.

Frequently Asked Questions
Question: I need a 4-door pedestal mailbox. Do you have them in stock?
Answer: Yes, we have 4 Door Pedestal Mailboxes as well as a 4 Door Pedestal Mount Horizontal Mailbox for private delivery.

Question: I need a pedestal unit for 3 tenants.
Answer: We do carry a 3-tenant pedestal unit. Please view our 4C Pedestal Mounted Mailbox with 3 doors for more details. Thank you.

Question: Do you have any cluster box accessories?
Answer: Yes, please view our Cluster Box Accessories for more details. Thank you.

Question: Can you quote a mailbox for a six-unit condo? We need six 4c horizontal boxes with one outgoing, including key and slot. Please include metal covering, black powder coat, and wall mounted.
Answer: The cost of the 4C mailbox would be $1,082.59 with free shipping. This includes the surface mount collar for wall mounting the 6 Tenant Mailboxes.

Question: I need a 4-unit exterior wall-mounted cluster box with a parcel locker.
Answer: Either the double column 4-Door 4C or the single column 4-Door 4C could be what you need. These units can be purchased with surface mount collars and meet all current USPS regulations.

Question: I need a two-unit pedestal mailbox that is USPS approved with two separate key-ways. Do you have them?
Answer: The 2 Door 4C Pedestal Mailbox mount is currently the only thing on the market of this size. Also, it does require local approval with the USPS. If you need a pre-approved USPS mailbox, the 4-Door CBU may be suitable.

Question: I need a two-business mailbox that wall mounts for as cheap as possible. Do you have something like this?
Answer: The smallest wall mount unit available is the 3-Door Vertical Mailbox. However, the third door can be used as an outgoing mail slot.

Question: I am looking for apartment mailboxes with 4 units.
Answer: The 4-Compartment Vertical Apartment Style Mailboxes can be recessed, semi-recessed, or surface mounted. Or if you need something for a new development, the 4-Door CBU is pre-approved for USPS delivery.

Question: I am looking for a 9-door mailbox for a 4-plex. It must be front loading for USPS.
Answer: Please view this 9-Door, front loading, USPS-approved mailbox. It is a double-column unit with one outgoing mail slot and a large parcel locker.

Question: Which USPS mailboxes are the tallest for rear loading? Either 20 or 40 doors?
Answer: The tallest USPS approved, rear loading mailbox is going to be anything in the Maximum Height Rear Loading 4C category.

Question: How high and how low can the mailslots be installed to meet USPS regulations?
Answer: The bottom of the slot must be at least 30 in. above floor. See our 4C Mailbox Overview page for more information.

Question: I need a "Snow Bird" mailbox deep enough to hold mail for 4 months and lockable from the back.
Answer: The Geneva Locking Mailbox may be exactly what you need. It can be purchased with a post as well.

Question: Do you have replacement parts for cluster boxes, I can't seem to get a direct search result.
Answer: Yes we do sell cluster box parts. What specific part are you looking for?

Question: I need a pedestal box for 5 units. What is the cost?
Answer: We offer the 5-Door Front Loading 4C Pedestal from Auth-Florence. Pricing is on the product page. Note: these units require USPS Approval. However, the 8-Door Cluster Mailbox is already USPS approved. Pricing for this mailbox is also on the product page.

Question: I have an existing brick mailbox. Do you make a locking cover that will bolt to the brick to cover the front?
Answer: I'm not sure exactly what you are looking for. Please call (866) 707-0008 for assistance. If the product is on in our catalog, we can help you find it.

Question: I am looking for lockable horizontal units capable of holding a fair quantity of mail. I need 2 boxes in one stucco unit.
Answer: How many tenant doors do you need? We have stucco mail centers that might work.

Question: Is there an installation kit for a cluster box with 8 units?
Answer: Installation hardware is included with a CBU, but there is no installation kit sold separately. What parts are you looking for?

Question: We need a 40 door pedestal unit. Can you give us a price?
Answer: There is no 40-door CBU. But you can purchase two 20-door pedestal mailboxes. Note: if you intend to use these for USPS delivery, then you will need to contact your local post office to get pre-approval before purchasing. Price is located on the product page.

Question: I need a replacement steel post for a cluster box. The original post is 4 in. x 6 in. x 31 in. Do you have this in stock?
Answer: We will need to know what CBU model you have to get you the proper pedestal. Please call (866) 707-0008.

Question: Who manufactures your cluster units?
Answer: We sell cluster box units made by Auth-Florence and Salsbury Industries.

Question: I am looking for a one-door mailbox for a commercial building. I have a picture of the old one. Could you please send me an email and I will forward you the picture?
Answer: Please email your request to

Question: Do you have 8-door roadside locking boxes?
Answer: Yes. Please see our 8-Door Standard CBU Mailboxes. Thank you.

Question: I need a 12-bay mailbox with a pedestal included.
Answer: We have those. Please view our 12-Door CBUs. All of our CBUs come with pedestals.

Question: I only need a 2-unit pedestal or wall-mount box.
Answer: Okay, in that case I recommend either the 2-Door 4C Pedestal or the 2-Door Wall Mount 4C mailbox.

Question: We are interested in putting a 25-package locker in our building. Can someone come and give us information about pricing and installation?
Answer: Unfortunately, we do not have any field service technicians and we do not quote installations at this time.

Question: I need a 4-door model that has an area below or above for bulk mailers.
Answer: Please see this 4-door mailbox or call us at (866) 707-0008 for assistance.

Question: I need a recessed wall mount with four doors and a bin for mailers.
Answer: Please take a look at this 4 Door Recessed 4C Mailbox. It has four tenant doors, a parcel locker for receiving large packages, and an outgoing mail slot.

Question: The owner of our complex is specing the following:
  • Model 3308, Type1: 8 compartments with 1 outgoing mail receptacle and 2 parcel lockers
  • Model 3312, Type II: 12 compartments with 1 outgoing mail receptacle and 1 parcel locker.
Are these available? We have 20 total units. Is there anything else available for this many units? They will be mounted outdoors.
Answer: The above configuration of one 12-door and one 8-door CBU should be best suited for 20 tenants. But you can also check out these other commercial mailbox options.

Question: I need a cover plate for an outgoing mailbox.
Answer: We do not sell that part. Please contact your product manufacturer and see if their warranty covers replacement parts.

Question: What is the ratio of parcel boxes to mailboxes?
Answer: The USPS recommends that you have 1 parcel box for every 10 tenants. Thank you.

Question: Do you have a 20-door, 2PL outdoor unit for USPS delivery?
Answer: For USPS delivery, you will likely need to go with one 12-door CBU and one 8-door CBU, as these are pre-approved for USPS delivery. The 20-door 4C Pedestal mailbox is also an option, but you will need to check with your local post office for approval before purchasing.

Question: Do you sell the Medeco locks for the commercial boxes?
Answer: Yes, we do sell Medeco Locks. They are not for a particular commercial mailbox. The SKU is LOCK-MEDECO.

Commercial Mailboxes
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Wall Mount Mailboxes Locking Mailboxes Commercial Residential