Cluster Mailboxes for Centralized Mail Delivery

A cluster mailbox or 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 approved by the U.S. Postal Service. Since all cluster boxes are USPS Approved mail delivery equipment, they are the most common community mailboxes on the market. (To view other commercial mailboxes, click here). They also come in six (6) different architectural colors and can be modified to fit any community design. The colors include Sandstone (our most popular), Black, Bronze, Gray, Green, and White.

Our US mail supply manufacturers equip every CBU with an outgoing mail slot and houses between one and two parcel lockers for package delivery (note: you can purchase an eight-tenant unit with up to four parcel lockers).

Installation: If you need someone to install your cluster mailbox, we offer installation options on each CBU product page. Choose the option that best suits your requirements for cluster units. After you place the order, we will send you info regarding the installation process and the next steps. For more details on our CBU installation program, please see this article. Once you install your CBU, you can contact your local postmaster to come out and install their proprietary Arrow Lock, which allows the mail carrier to deliver to all tenants.

Note: While the Cluster Mailboxes found on this page are pre-approved by the USPS for centralized mail delivery, customers may wonder if the same is true of 4C pedestal mailboxes. The answer is: no, 4C pedestal mailboxes require pre-approval by the USPS before you purchase and install if you intend to use them for USPS mail delivery. If you intend to use a 4C pedestal for private use, then this should not be a point of concern. If you have questions about this, feel free to give us a call. Update: as of November 2020, all 4C Pedestal Mailboxes are discontinued. The USPS spec cluster box unit is now the industry standard for outdoor pedestal mounted centralized mail receptacles.

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 your next commercial or residential development project's needs. 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.

Options for USPS approved Cluster Mailboxes include:

The Standard CBU is USPS Approved

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

• 8-Door Cluster Mailbox
• 12-Door Cluster Mailbox
• 13-Door Cluster Mailbox
• And the 16-Door Cluster Mailbox (our best-seller and the best option for the value; also known as the USPS Access Type III cluster box unit)

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. All clustered mailboxes come equipped with an individual compartment lock for complete mail security.

The USPS Approved F-series type Cluster Mailbox is available here in six different tenant door configurations and in six architectural color options among which to choose. We offer quantity pricing for two or more units, in addition to other CBU mailbox features (see individual product pages for details).

We always include pedestals.. Shop with confidence, and feel free to call, email, or open a chat with one of our product experts.

You can also see a similar selection in High Security and Decorative options below.

The High-Security CBU (also USPS Approved)

While our manufacturers build the standard cluster box to prevent theft, the High-Security pedestal option can significantly reduce the risk of mail and identity theft. You can purchase the vandal-proof fasteners to attach to the unit's anchor bolts for these units. The manufacturer has also designed the master front loading door to prevent prying, making it nearly impossible for mail thieves to break open the master door. In general, the latest industry-standard Cluster Mailboxes boast a thicker, reinforced metal gate with a larger diameter hinge rod on all tenant doors.

Ideal for university mailing (and other applications), shop cluster mail box units approved by the U.S. Postal Service. Both Florence Corp. and Salsbury Industries boast the largest CBU mailbox inventory in the United States, and we are proud to be their online suppliers. Between both manufacturers, the architectural spec sandstone cluster box units are the most popular.

The Decorative CBU (also USPS Approved)

Decorative CBUs are identical to the standard units, except for 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. The Florence CBU boasts two decorative styles. Shop Florence Commercial Mailboxes to view these styles and options.

4C Pedestal Mailboxes

Note: All manufacturers of 4C Pedestal Mailboxes have discontinued these units. They will no longer manufacture these mailboxes in the U.S. as of 11/30/2020.

The 4C Pedestal mailbox is very similar to the CBU, except the 4C pedestal is not pre-approved by the USPS. These units will require USPS approval if 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 before 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.

Cluster Mailboxes FAQ

📫Who is responsible for cluster mailboxes?

While the post office is responsible for installing and maintaining their proprietary Arrow Lock on the cluster mailbox master door, the purchase, installation, and maintenance of cluster mailboxes remain the customer's responsibility. If you are a property manager, you are responsible for cluster mailboxes. If you are a member of an HOA, please refer to your HOA's Covenants, Conditions & Restrictions document. Here's a good article with more info.

• Responsibility: the USPS is responsible for installing and maintaining the Arrow lock. The CBU owner is responsible for the installation, maintenance, and preservation of the mailbox unit itself.
• You, the CBU owner, are Accountable to install and maintain the cluster mailbox(es).
• The USPS will install and maintain their proprietary Arrow lock mechanism for the master door.

📭How do cluster mailboxes work?

Cluster mailboxes (sold in our online mailbox retail store) are designed to provide secure mail access to multiple tenants from a centralized location. After the customer installs their CBU and sandstone pedestal, the USPS then installs their proprietary Arrow lock to access the entire unit via the master door. Parcel boxes (or parcel lockers) are accessed via a special key left in the tenant’s individual compartment by the postal carrier. Tenants can then retrieve their mail from individual compartments at their convenience. And that's it. For more details, view this article on how cluster mailboxes work.

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📬How does the post office access cluster mailboxes?

After the customer installs their cluster mailbox, the postal carrier then installs the USPS proprietary Arrow lock to access the entire unit via the master door.

Once you contact your local post office, the USPS or postal service carrier would schedule a time to service the CBU mailbox units and install the Arrow lock on site.

📮Are cluster mailboxes USPS approved?

Yes, all cluster mailboxes (or cluster box units) are pre-approved by the USPS for incoming and outgoing mail.

The US Postal Service prefers and in some cases requires that new residential developments purchase cluster mailboxes. For installation and maintenance topics, visit this article.

📪Who is the manufacturer of USPS approved cluster mailboxes?

Florence Manufacturing and Salsbury Industries are the two primary manufacturers of USPS approved cluster mailboxes in the United States. We carry CBU mailboxes by both manufacturers here at Budget Mailboxes. Note: Salsbury cluster mailboxes often ship faster.

Since there are only two main manufacturers of postal approved cluster box units in the United States, much of the supply chain is dependent on their mailbox inventory and production at the factory level. If you have questions about which types of cluster mailboxes are pre-approved for centralized mail delivery, contact your local post office.

📬What are Cluster Mailbox compartment sizes?

Cluster mailbox tenant compartments come in three sizes:

• Standard, 3 in. H x 12 in. W x 15 in. D
• Large, 4 - ¾ in. H x 12 in. W x 15 in. D
• Extra Large, 6 - ½ in. H x 12 in. W x 15 in. D

Note: the tenant compartment size directly corresponds to the number of tenant doors available. Standard compartment sizes come in 8, 12, and 16-tenant configurations, while the large compartment size comes in a 13-tenant-door configuration. Finally, the extra-large compartment size is only available in a 4-tenant-door configuration.

For USPS mailboxes and clusters, the standard and large sized tenant box both accommodate most types of daily mail.

What to Know About Neighborhood Cluster Mailboxes

Newer neighborhoods and residential developments often utilize CBU mailbox installations at centralized locations. Cluster box units are convenient for the USPS and save the postal carrier time. Rather than having to deliver mail to each of your neighbors, the postal carrier delivers mail to a central location. To check your tenant boxes may require a short walk from your house to the centralized location, or you can pick up your mail from the cluster box mailboxes on your way in or out of the neighborhood.

Shopping for neighborhood mailbox clusters? Salsbury cluster mailboxes ship fast.