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All 4C Horizontal Mailboxes

Shop 4C Horizontal Mailboxes

All 4C horizontal mailboxes sold from U.S. Mail Supply are compliant with all U.S. Postal Service regulations. All 4C horizontal mailboxes are guaranteed to keep your mail secure. Find the right 4C mailbox for your commercial or residential area.

Wall-Mounted 4C Horizontal Mailboxes from US Mail Supply

U.S. Mail Supply has your wall-mounted 4C horizontal mailbox solution that complies with the newest U.S. Postal Service regulations. U.S. Mail Supply will assist you in configuring the most efficient and practical mailbox layout for your specific project while maintaining compliance with the most up to date postal regulations. All of our 4C mailboxes meet high postal security standards to help prevent identity theft and keep your mail safe and secure.

Get a quote for a custom 4C mailbox configuration

Shop all 4C mailboxes for sale from U.S. Mail Supply.

Shop STD-4C Mailboxes for Apartments, Multi Family Residences and Commercial Buildings

Florence versatile™ 4C mailboxes provide pre-configured mail slots and parcel lockers for commercial & residential buildings like apartments, multi-family complexes, military bases, condos, and any new construction.

Apartment 4C Horizontal Wall Mount MailboxesRecess Wall Mounted 4C Horizontal Mailboxes

Choose surface mount or recess mounted mailboxes for indoor applications or depot 4C mailbox (for private delivery ONLY).

Shop 4C horizontal mailboxes by unit height:

6 Door 4C Horizontal Mailbox with 1 Parcel Locker and 1 Outgoing Mail Slot
3 Parcel Locker STD-4C Horizontal Locker

Depending on the unit height & width you may order individual mailboxes with as little as 2 or as many as 20 USPS approved mailboxes. 

4C Horizontal Mailbox Features

Florence 4C Horizontal Mailbox Features

Florence Versatile 4C Mailbox Features and Specifications

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 have a 4C mailbox system. To adhere to USPS installation requirements, your 4C Mailbox:

  • Should not exceed 67” from the finished floor to the top row of locks
  • There must be at least 28” from the finished floor to the bottom of the lowest tenant compartment.

USPS STD-4C Horizontal Mailboxes

An exception can be made and this dimension can be minimized as low as 15” only when the lower compartments are 4C Mailbox parcel lockers. Our 4C horizontal mailboxes are front-loading only (mail carrier access from the front).

Check out our selection of USPS STD-4C Compliant mailboxes, and contact us to work out the best mailbox configuration for you!

Parcel Locker Requirements

4C Horizontal Wall Mount 2 Parcel LockerYou must satisfy a 1:5 parcel locker to mailbox ratio requirement. If the number of parcel lockers in your mailbox installation exceeds the 1:5 requirement, smaller parcel lockers may be included. 

For example - if your project requires 100 mailboxes, at least 20 parcel lockers with a minimum size of 15"H x 12"W x 15"D must be included. 

BE SURE TO NOTE the parcel locker height when utilizing only one 4C module type. Not all built-in lockers are 15" tall and may require the addition of parcel only modules to comply with the 1:5 parcel locker USPS requirement.

Read up on the details of STD-4C regulation & specifications for USPS approved 4C horizontal mailboxes.

Color Options for 4C Horizontal Mailboxes

Customize your 4C mailbox(es) with one of eight different architectural color options with a durable powder coat finish.

STD-4C Locking Horizontal Mailbox Antique Bronze

Antique Bronze

Florence versatile 4C Locking Horizontal Mailbox for USPS Delivery


USPS Delivery 4C Horizontal Mailbox Dark Bronze

Dark Bronze

Commercial 4C Horizontal Mailbox with Locking Doors Gold Speck

Gold Speck

Locking 4C Horizontal Mailbox Postal Gray

Postal Gray

Florence Versatile 4C Horizontal Mailbox Sandstone


Locking STD-4C Horizontal Mailbox Silver Speck

Silver Speck

4C Horizontal Mailbox White


** Colors shown are representative of the actual powder coat finish but are limited by printing conditions. It may vary slightly from the finished product.

4C Mailbox Decal Preview

Here's how the decal will look.

4C Mailbox Engraving Preview

Optional engraving into aluminum door.

Door ID Options

Decals: 4C mailboxes come standard with silver adhesive decals. 1-1/2" high x 1-3/4" wide. Black letters. Can contain up to five characters per decal.

Engraving: Uses USPS standard US Block font and is 3/4" tall. 12 characters per line, up to two lines per door.

Shop all mailboxes for sale online from U.S. Mail Supply.
Make sure to choose the RIGHT mailbox.

Don't worry, we can help you figure out what's best and most cost efficient for your space. A representative at U.S. Mail Supply will help you figure out what is required for USPS or private delivery, the number of units you need and any information required for installation.