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Cluster Mailboxes for Centralized Mail Delivery

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Standard Cluster Box Units - USPS Approved
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What is a Cluster Box Unit?

A cluster box unit (CBU) is a free-standing, pedestal mailbox with 8, 12, 13, or 16 individually locked mailbox compartments and up to 2 integrated parcel lockers. Since all cluster boxes are USPS Approved, they are the most common community mailboxes on the market. They also come in six (6) different architectural colors and can be modified to fit any community design.

Choosing the right Cluster Mailbox (CBU)

Are you looking for the right cluster box to fit your needs? We can help! We offer a wide selection at the lowest prices to meet the needs of your next commercial or residential development project. If this is your first time purchasing a cluster box unit, below is some information you may find helpful. Of course, feel free to call us at (866) 707-0008 or open a chat window (bottom left of the site) with one of our reps if you need immediate assistance.

The Standard CBU is USPS Approved

The following CBUs are already pre-approved by the USPS:

  • The 8-Door
  • The 12-Door
  • The 13-Door
  • And the 16-Door (our best-seller and the best option for the value)

8 Door Cluster Box Unit12 Door Cluster Mailbox13 Door Cluster Box Unit16 Door Cluster Mailbox

We also offer a 4-Door unit with larger doors (model # 1570-4T5) and an 8-Door unit with 4 parcel lockers (model # 1570-8T6) that are also USPS approved. If you are unsure which of these options best suits your needs, feel free to call and speak to one of our product experts. They can help you find the right unit within your budget.

You can also see the same selection in High Security and Decorative options below.

The High-Security CBU (also USPS Approved)

While the standard cluster box is already built to prevent theft, the High-Security option can significantly reduce the risk of mail and identity theft. For these units, the master front loading door is built to prevent prying, making it nearly impossible for mail thieves to break open the master door. The High-Security also boasts a thicker, reinforced metal gate with a larger diameter hinge rod on all tenant doors. Additionally, they are equipped with a heavy-duty stainless steel pedestal.

The Decorative CBU (also USPS Approved)

Decorative CBUs are identical to the standard units with the exception of the Pedestal and Cap. For Auth-Florence models, you can choose either the Classic Decorative unit or the Traditional Decorative unit. For Salsbury models, you can select the Regency option. Images of these three options are displayed below.

Classic Decorative Mailbox ClusterTraditional Decorative Cluster BoxesRegency Decorative CBU

4C Pedestal Mailboxes

The 4C Pedestal mailbox is very similar to the CBU, but with one exception: the 4C Pedestal is not pre-approved by the USPS. These units will require USPS approval if they are going to be used for USPS mail delivery and outgoing USPS pick-up. We strongly recommend that you contact your local postmaster for approval of the 4C Pedestal Mailbox prior to completing your purchase. Feel free to call and speak with one of our product experts if you need more information.

CBU Accessories and Related Products

We offer a wide selection of cluster box accessories and related products. Among the best-sellers, we offer the standard USPS Approved Parcel Locker. You can select from either a 2-Parcel unit or a 4-Parcel unit, and in one of six color options to match your selected unit. Although standard numbering will ship the fastest, custom numbering is available.

Five Year Warranty

5 Year Product Warranty

Every cluster mailbox we sell comes with a Five (5) Year Warranty.

Florence Manufacturing provides a five (5) year Warranty on its products from the date of purchase from an Authorized Florence Dealer.

Likewise, Salsbury Industries covers defects in material and workmanship if reported in writing to them within five (5) years of the delivery date for any cluster mailbox.

Wide Tenant Boxes Accommodate Larger Envelopes and Magazines

Wide Box

Shown above: the 16 Door CBU Tenant Box (3 in. high)

Wide Box

Shown above: the 13 Door CBU Tenant Box (4 - ¾ in. high)

The CBU tenant compartment size is the current USPS Standard for centralized mail delivery. Under 4C regulations, the tenant boxes are wider so that all mail, including larger envelopes and magazines, can be delivered flat without any folding. There is also enough room in each tenant box for small-sized parcels.

What is included with the CBU?

What is included with the CBU?

The CBU cabinet and pedestal are packaged separately. Below is a list of components and hardware you will receive in each package.

Pedestal shipping box includes:

  • Template guide to locate the pedestal base anchors.
  • Rubber Pad to be installed between the ground and the pedestal base.
  • The Pedestal, fully assembled.

Cabinet shipping box includes:

  • Cluster mailbox and integrated parcel lockers.
  • Hardware kit in plastic bag (shipped inside the CBU compartment) that includes:
    • Pedestal hardware.
    • Tenant door keys.
    • Parcel keys and tags.
    • Installation manual.
  • Cleaning instructions.
  • Parcel door hardware (in a plastic bag inside the cabinet). This includes two (2) McGard screws and three (3) two-way screws, four (4) Arrow Lock nuts, and panel lock covers attached with temporary plastic fastener.

Need more info? Check out the video overview below.

Frequently Asked Questions
Question: Are there illuminated mailboxes in large cluster box design?
Answer: There is a Light Kit that is designed for use with a Centralized Mail Station.

Question: Do high-security cluster mailboxes come with private locks?
Answer: Thanks for your question. High-Security Cluster Mailboxes have optional private locks for post office use, or you can purchase the CK25750 Conversion Kit.

Question: do the cluster boxes come with hardware to mount to ground?
Answer: No, that hardware has to be inserted in the concrete when it is poured. You will need to purchase it from a local hardware store prior to installation.

Question: Is there a wireless cluster mailbox alert system to know if the mail has been delivered? I live 6 streets from our cluster mailbox location.
Answer: Not that we are aware of. None of our cluster box manufacturers make one at this time.

Question: We have approximately 120 boxes housed in cluster style fixtures and would like to cover them with a roof in order to protect customers and mail from direct rain. Do you represent or recomend any such covers?
Answer: The Vario Shelters can be used with out the casings and will provide the shelter you are seeking. They are available in various sizes.

Question: Do you sell replacement locks
Answer: Yes we do. Let us know who the manufacturer of your cluster box is and we will provide you with the correct item code for ordering.

Question: I am looking ofr digital combination cluster boxes to be used in a University environment for student mail mounted into a wall. We are looking for a quantity of 5000.
Answer: We are not aware of a digital combination lock on the market but we do have some alternatives to the old style combination locks. If you would like to know more, give us a call.

Question: Do you finance?
Answer: No, we currently do not offer financing; however, we do accept purchase orders in most cases.

Question: Where can I get the pins to go on the door?
Answer: We sell the Long Hinge Rod/Pin for Type III & Type IV. However, they are specific to each manufacturer. You will need to verify who your unit was manufactured by.

Question: I am looking for a 10-door CBU unit.
Answer: The USPS Cluster Box Units are only available in a 8,12,13, and 16 door configuration.

Question: Do you know of any cluster mailboxes that also open from the back for delivery?
Answer: A rear-loading CBU is no longer being made.

Question: Do you have used cluster mailboxes?
Answer: Unfortunately, no. We presently do not sell used items.

Question: Are the 29-door units USPS approved?
Answer: This unit requires approval from your local USPS. It is not ADA Compliant nor does it meet the 1:10 parcel locker to customer compartment ratio.

Question: Do you ship to Hawaii?
Answer: Yes, we do ship to Hawaii.

Question: Do you have a cluster mailbox with doorbell for 6 units?
Answer: The only mailboxes that have a push-button doorbell are the 6 Compartment Vertical Apartment Style Mailboxes.

Question: Do you have high-security 6-door CBUs?
Answer: No, high security is only available in 8, 12, 13, and 16 doors.

Question: How do I get new keys for my cluster mailbox?
Answer: You can either buy the key blanks and have them cut or you will need to buy new locks that will come with the keys.

Question: I need a 22-door cluster-free standing boxes.
Answer: Search code 3412D-22 to view the 22-door mailbox.

Question: How do you install the 3312R?
Answer: Please click the link to view the Installation Instructions. Thank you.

Question: I need two 17-door vanilla mailbox stations without the parcel box. Do you have these?
Answer: Please click the link to view the 17-Door Cluster Unit.

Question: Do you have a high-security cluster box for 3 or 4 customers. Can you supply one made of steel rather than aluminum? I have had three vandal break-ins.
Answer: The High-Security Pedestal-Mount Cluster Box Units only come in configurations of 8, 12, 13 and 16 doors.  We do have a Recess-Mounted High-Security Cluster Unit that comes in 4 doors and is made of steel. Please click the link to view the 4C Wall Mount 4-Door High-Security Horizontal Mailbox.

Question: Do you have any plexi sign holders that can be affixed to the CBU mailboxes?
Answer: No, unfortunately we do not have plexi sign holders for the CBUs, but we do have Custom Placards that can be ordered.

Question: What is the largest cluster available?
Answer: The 29-door unit SKU: WL-4CPF24CFT8-29BM

Question: Where can I find the name at on the boxes?
Answer: The manufacturer name is normally located somewhere on the front of the unit, usually on the Outgoing Mail door or in one of the bottom corners.

Question: the magnet which allows the front of the mailbox to open is missing. How do we get another one?
Answer: Please call for assistance.

Question: I need an outdoor pedestal mailbox that has 5 doors and does not let rain water in. Which one fits these requirements?
Answer: Please search this SKU for the 5-door Commercial Box Unit: WL-3411D-05SANBM

Question: We have a mailbox that continues to be vandalized. The vandals rip the door off. Do you have anything that is hard to vandalize? Thank you.
Answer: Please view this Ultimate High-Security Mailbox to view our most secure and vandal-resistant residential mailbox. If you need a Cluster Unit, the High Security units are the most vandal proof. Thank you.

Question: Do the decorative mailboxes come with keys for the 16-unit Salsbury?
Answer: All cluster mailboxes come with keys.

Cluster Mailboxes for Centralized Mail Delivery
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