4C Horizontal Mailboxes – USPS Approved and STD-4C Compliant

4C Horizontal Mailboxes from National Mailboxes comply with the newest US Postal Service (USPS) regulations required for all new construction and major renovation wall mount installations. Our 4C Horizontal Mailboxes meet high postal security standards to help prevent identity theft and keep mail safe and secure. STD-4C mailboxes also include built-in parcel lockers and stand-alone parcel locker options.

4C Horizontal Mailbox Outdoor Installation

4C Horizontal Mailboxes are incredibly versatile and can be Surface Mounted on a wall, Recessed into a wall so the front of the mailbox unit is flush with the face of the wall, or mounted in a Freestanding Mail Stand Enclosure which can be placed anywhere. They are USPS approved and can also be used for Private Delivery. Private delivery means that non-USPS personnel deliver mail to individual compartments, like at universities. Mailbox installations for private distribution are not required to adhere to strict USPS Approved specifications and have more flexibility in how they are installed.

4C Horizontal Mailboxes from National Mailboxes come in a wide range of sizes, configurations, and color to fit every installation need. They are perfect for use at commercial and residential buildings like apartments, condos, multi-family complexes, military bases, college campus housing, or residential neighborhoods that want to have centralized mail delivery. National Mailboxes will help you configure the most effective and practical mailbox layout for your specific project while maintaining compliance with the most up to date postal regulations. Contact our Customer Service Center at 1-800-676-5161 for assistance.

Shop for 4C Horizontal Wall Mount High Security Mailboxes:

4C Horizontal Mailboxes Features

  • USPS Approved and Postal Certified for US Mail Delivery
  • Modular designs with nearly 150 base modules
  • Vary in height and mounting options
  • Accommodate 1-29 residents per Mailbox Unit
  • Multiple 4C Mailbox units can be used together to create larger centralized mail delivery installations
  • Incorporate security features to help prevent break-ins
  • Include convenient, secure outgoing mail collection compartments
  • Provide a greater degree of customization to complement the look and feel of a development
  • Can be Recess Mounted or Surface Mounted (Surface Mount Collars available for an additional charge)
  • Can be installed indoors or outdoors
  • Front loading only (mail carrier accesses the tenant mailboxes from the front of the unit)

Product Design & Security Features

4C Product Design & Security Features 1

4C Product Design & Security Features 2

4C Mailbox Use and Regulations

As of 2006, all new construction, new mailbox applications, and major renovation sites using centralized wall-mounted USPS mail delivery are required to use a 4C mailbox system. To follow the USPS installation requirements, your 4C Mailbox system should not exceed 67″ from the finished floor to the top row of locks, and must be at least 28″ from the finished floor to the bottom of the lowest tenant compartment. An exception can be made and this dimension can be minimized as low as 15″ if the lower compartments are 4C Mailbox Parcel Lockers.

Parcel Locker Requirements

The USPS requires at least one Parcel Locker for every 10 mailbox compartments. So, if your project requires 100 mailboxes then you will need at least 10 parcel lockers with a minimum size of 15″H x 12″W x 15″D. With the rise in online retail and package delivery we recommend having at least one Parcel Locker for every 6 mailboxes. If the mailbox installation exceeds the 1:10 requirement then smaller parcel lockers may also be used. Shop 4C Parcel Lockers.

4C Horizontal Wall Mount Mailbox Color Options

Customize your 4C Mailbox installation from National Mailboxes with one of eight different architectural color options. All colors come in a durable powder coat finish to provide many years of reliable service. Available colors include Antique Bronze, Black, Dark Bronze, Gold, Postal Grey, Sandstone, Silver Speck, and White. Colors shown below may vary slightly due to variance in computer monitors. Pantone color numbers shown in parenthesis are for reference purposes only. Color availability may change without notice.

4C Horizontal Mailbox Color Options

Door Identification Options

Decals: All 4C modules come standard with silver adhesive decals which are 1-1/2″H x 1-3/4″W. Black lettering can contain up to five characters (alpha and/or numeric) per decal.

Engraving: Custom engraving uses the USPS Standard US Block font and is 3/4″ tall. All engraving can include up to 12 characters on one or two lines.


Additional Information:

Choosing Centralized Mailboxes that Comply with the US Postal Service Regulations
Accessibility Installation References and ADA Requirements
Shop all Commercial Mailboxes from National Mailboxes