U.S. Mail Supply Categories

Indoor Commercial Mailboxes

Commercial indoor mailboxes for USPS delivery or private delivery

Shop five different styles of indoor commercial mailboxes from US Mail Supply. We carry 4C horizontal mailboxes, vertical mailboxes, postal drop boxes, and more. Indoor commercial mailboxes from US Mail Supply can be wall or recessed mounted in the lobby of your commercial property. We even offer floor mounted units. Approved for both private use and USPS delivery, all commercial mailboxes from US Mail Supply are built to USPS size and construction standards. Indoor commercial mailboxes are perfect for a wide variety of commercial properties and can be installed in virtually any lobby. Not sure what you need? US Mail Supply will help you choose a mailbox for your commercial facility. Indoor commercial mailboxes from US Mail Supply are perfect for:

  • Office building lobbies
  • Apartment building lobbies
  • Schools
  • Dormitories
  • And more

Shop Indoor Commercial Mailboxes

Commercial 4C Horizontal Mailboxes for Sale4C Horizontal Mailboxes

Versatile 4C horizontal mailboxes from US Mail Supply are a heavy-duty option for businesses in need of commercial indoor mailboxes. The wall mounted 4C horizontal mailbox can support up to 20 tenants. Built to USPS size and construction standards, 4C indoor commercial mailboxes are designed to withstand whatever life throws at them.

Indoor Postal Drop Boxes for SalePostal Drop Boxes

Indoor commercial postal drop boxes from US Mail Supply are USPS approved and are available in a wide range of styles and sizes. Pedestal mounted commercial drop boxes meet all USPS size and construction requirements. Packages and letters will be safe in a locking commercial drop box from US Mail Supply.

Commercial Horizontal Mailboxes for SaleHorizontal Mailboxes

Built to withstand a lifetime of use, horizontal indoor commercial mailboxes from US Mail Supply are made of heavy-duty steel and aluminum. Their recessed wall mounting style makes them an ideal space saving option for use in office and apartment lobbies.

Commercial Vertical Mailboxes for SaleVertical Mailboxes

Wall mounted vertical mailboxes from US Mail Supply are a great option for businesses looking for indoor commercial mailboxes. Vertical mailboxes can be wall mounted, making them ideal for use in office and business lobbies. Choose from 3 to 7 doors.

Shop More Commercial Mailboxes

With a massive collection of commercial mailboxes to choose from, business owners have no trouble finding the right mailbox unit for their property. Shop for USPS approved and private use mailboxes, or shop for indoor or outdoor units. 

Commercial USPS Approved Mailboxes for SaleCommercial Mailboxes for USPS Delivery
Commercial Mailboxes for Private DeliveryCommercial Mailboxes for Private Delivery
Commercial Outdoor Mailboxes for SaleOutdoor Commercial CBU's
All Commercial Mailboxes for SaleAll Commercial Mailboxes
Shop all mailboxes for sale at our online store.