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4B Horizontal Mailboxes


4B Mailboxes Based on Doors Size
72 Products
Starting at $597.97
24 Products
Starting at $597.97
25 Products
Starting at $479.94
16 Products
Starting at $479.94
4B Mailbox Parts & Accessories
4B Mailboxes - Parts
9 Products
Starting at $2.97
4B Mailboxes - Collection Units
48 Products
Starting at $797.97

More info about 4B Horizontal Mailboxes

Budget Mailboxes is proud to supply durable, secure 4B horizontal mailbox units in several configurations for replacement of your existing mailbox system. Our 4B horizontal mailboxes are available in 2 door sizes (5 in. x 6 in. or 5 in. x 12.5 in.) as well as multiple options of individual box quantities to fit your exact specifications. Made of durable aluminum construction with stainless steel locks and hinges, these units are engineered to provide years of service.

These front and rear loading mailboxes allow delivery by the on-site staff.

4B units are designated “Private use” for new construction, meaning they are approved only for use by a private organization such as office buildings, apartment complexes, colleges, etc. unless they are being purchased to replace an existing 4B mailbox installation. Collection units are also available, as well as replacement keys for existing units. Collection units allow tenants to drop outgoing mail for pickup in one secure and convenient location.

As alluded to above, the USPS mandates that the 4B mailbox is no longer acceptable for new construction. These mailboxes are available only as replacement units for existing 4B applications. The 4C mailbox is the current USPS standard for all new construction. If you intend to use the 4B horizontal for USPS delivery, then we encourage you to contact your local postmaster before placing your order.

If you are required the installation of a 4C mailbox, please visit our many models of 4C horizontal mailbox designs to find a perfect fit for your location.

Frequently Asked Questions
Question: what is the cost to install a cluster of mailboxes?
Answer: Sorry, but we don't offer a mailbox installation service.

Question: I'm looking for a front loading data distribution boxes with locks.
Answer: Please view our selection of  Data Distribution boxes for more details. Thank you.

Question: What are the door and compartment identification options for the 4B Horizontal mailbox?
Answer: Each mailbox door includes a 2'' W x 5/8'' H clear plastic card holder to identify the tenant's name and/or box number. Self-adhesive numbers (1-3000 available) are supplied upon request with a standard order. Custom identification systems are available as an option upon request. Label holders (#1070) neatly organize and identify the front/rear of the mailbox compartments and are available as an option upon request. Thank you for your inquiry.

Question: do you guys sell only doors? I'm missing 5 in my property, let me know.
Answer: Yes. If you can identify the specific mailbox you have, on the budgetmailboxes.com listing for that mailbbox, there is a section below the mailbox images for parts. You can find and purchase the mailbox door from there.

Question: Do you have a 16 horizontal mailbox with rear loading and private use only. Our current box is 28" wide, 23" deep and 23 1/2" high. There are 15 private boxes and the 16th box is for outgoing mail.
Answer: We carry a 15-door and an 18-door mailibox but do not have a 16-door mailbox available.

Question: Do you have an 8-bank mailbox available?
Answer: Yes, please view our 8-door horizontal mailboxes for more details.

4B Horizontal Mailboxes
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