Required for new construction and major renovations, 4C horizontal mailboxes are ideal for commercial buildings, multi-family housing units, apartment complexes, government and military bases, schools, colleges and other residential and commercial developments.

The new (USPS Approved) 4C Horizontal Mailboxes are high security type and front loading style with larger tenant compartments for more mail capacity, equipped with parcel locker compartments for packages and include outgoing mail compartments for outgoing mail.

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!

USPS approved 4C Horizontal Mailboxes factory direct from mailboxes.com. Ideal for new construction and are available in aluminum, brass, bronze, and gold finishes.

4C Horizontal Mailboxes are perfect for apartments, condos, office buildings, military bases, and residential developments. Made entirely of aluminum, they are USPS-Approved and come in both front and rear loading options.

Made of heavy duty aluminum and stainless steel hardware, Salsbury 3700 series U.S.P.S. approved 4C custom horizontal mailboxes and fully integrated parcel lockers are available as front loading or rear loading units and are designed for indoor or outdoor use.

USPS standard 4C horizontal mailboxes are wall-mounted centralized mailbox configuration units that your local post office now requires for any major renovation or new construction.