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The Centennial Post Mount Mailbox and Premium Steel Post Combination is your all-in-1 quick fix to improve your curb appeal and the solution to receive many or large packages. The Centennial Mailbox by Architectural Mailboxes is the first design to receive Postal Service approval against the new USPS Standard 7C regulation, released in late 2015. It’s large and ample mailbox compartment is designed to receive not only mail and magazines but multiple parcels. This means no more missed deliveries or parcels left out on the porch exposed to weather and thieves. Made with quality construction and heavy gauge materials complete with a die cast aluminum handle and rigid, powder coated steel flag. The Centennial is mounted onto a premium 3 in. Dia in-ground post constructed of 19-Gauge galvanized steel and fully powder coated for added durability and corrosion resistance. The decorative post has an upper skirt to hide any unsightly mounting hardware for your post mount mailbox. The 2-piece decorative post cover wraps around the bottom of the post and is constructed of ABS with UV inhibitors to resist fading and discoloration. The decorative post cover hides unattractive concrete work while providing an elegant, finished look. This attractive design combines aesthetics and functionality servicing all your mail and parcel needs in 1 kit.


  • Mailbox combination includes extra-large heavy-duty steel mailbox and premium galvanized steel decorative post and necessary hardware
  • Embossed side panels provide a place for house numbers to be applied
  • Mailbox has decorative frame molded frame, flag and cast aluminum knob
  • Post mount mailbox constructed of heavy gauge galvanized steel body equipped with stainless steel door pins then fully powder coated for corrosion resistance
  • Mailbox measures 14.1 in. W x 11.9 in. H x 18.3 in. D
  • Mailbox larger inner compartment can accept a USPS priority mail large flat rate box 12 in. x 12 in. x 5.5 in. and still has room for additional mail and parcels
  • Sleek magnetic door closure provides reliability all while keeping door firmly closed
  • Approved by the US postmaster general
  • Sturdy premium 3 in. Dia galvanized steel post designed for in ground installation
  • Cantilevered upper skirt covers any unsightly hardware from the mounting plate
  • ABS decorative post cover is UV stabilized for outdoor use and resists fading and discoloration
  • Includes mailbox, post, assembly hardware and installation instructions
  • Concrete footing is highly recommended for cantilever style posts


  • Brand: Architectural Mailboxes
  • Color: Black
  • Included: Assembly Hardware, Flags, Mailbox, Mounting Hardware, Posts
  • Mailbox Capacity (cu. in.): 2176
  • Mailbox Size: Extra Large
  • Mailbox Style: T4
  • Material: Galvanized Steel
  • Mount Type: Post Mount

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