Inground Post
For putting directly into dirt.
Does NOT slip over an existing wood post. If you need that, choose the Surface Mount Slip Over Post.
Mounting Posts
Mounting Posts for installing into the dirt, slipping over an existing post and mounting to concrete
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Surface Mount Slip Over Post
For sliding over an existing wood post or attaching to concrete.
Does not go into dirt. If you need that, choose the Inground Post.
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Choose Your Mounting Post
Start with the surface you have and the number of mailboxes you need to support.
Inground Post
Install a secure mailbox post directly into lawn or similar ground material.
$174.99$99.99
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Surface Mount Post
Bolt it to concrete or slip it over an existing standard 4 × 4 wood post.
$174.99$99.99
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Dual Mount Post
Install two side-by-side mailboxes on one in-ground foundation.
$149.99
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Surface Mount Plate
Secure a mailbox setup to the top of an existing standard 4 × 4 wood post.
$29.99$14.99
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Dual Mount Plate
Mount two Adoorn mailboxes on one compatible post with a clean shared support.
$39.99
Shop nowChoose the rightMounting Posts
Compare installation methods and mailbox setups side by side, then choose the mounting option that fits your property.
 Inground Post
|  Surface Mount Post
|  Dual Mount Post
|  Surface Mount Plate
|  Dual Mount Plate
| |
|---|---|---|---|---|---|
| Mounting method | Installs in dirt, grass or similar ground material | Bolts to concrete or slips over a 4 × 4 wood post | Installs in dirt, grass or similar ground material | Bolts to the top of a wood post | Bolts to the top of a wood post |
| Slips over post | No | YES | No | No | No |
| Mailbox setup | One post mount mailbox | One post mount mailbox | Two side-by-side mailboxes | One post mount mailbox | Two side-by-side mailboxes |
| Best for | A new curbside installation in soil | Concrete or slipping over an existing wood post | Two addresses or a shared curbside setup | Reusing an existing wood post | Converting one wood post into a dual setup |
| What’s included | Post and Surface Mount Plate | 41-inch post | Dual mailbox mounting structure | Surface mounting plate | Dual mailbox spreader bar |
| Learn more | Shop now → | Shop now → | Shop now → | Shop now → | Shop now → |
Inground Post
Mounting methodInstalls in dirt, grass or similar ground material
Slips over postNo
Mailbox setupOne post mount mailbox
Best forA new curbside installation in soil
What’s includedPost and Surface Mount Plate
Learn moreShop now →
Surface Mount Post
Mounting methodBolts to concrete or slips over a 4 × 4 wood post
Slips over postYES
Mailbox setupOne post mount mailbox
Best forConcrete or slipping over an existing wood post
What’s included41-inch post
Learn moreShop now →
Dual Mount Post
Mounting methodInstalls in dirt, grass or similar ground material
Slips over postNo
Mailbox setupTwo side-by-side mailboxes
Best forTwo addresses or a shared curbside setup
What’s includedDual mailbox mounting structure
Learn moreShop now →
Surface Mount Plate
Mounting methodBolts to the top of a wood post
Slips over postNo
Mailbox setupOne post mount mailbox
Best forReusing an existing wood post
What’s includedSurface mounting plate
Learn moreShop now →
Dual Mount Plate
Mounting methodBolts to the top of a wood post
Slips over postNo
Mailbox setupTwo side-by-side mailboxes
Best forConverting one wood post into a dual setup
What’s includedDual mailbox spreader bar
Learn moreShop now →
Helpful answers
Mounting post FAQs
Everything to know before choosing and installing the right mounting post or plate.
Which Post slips over an existing 4x4 Wood Post
The Surface Mount Post slips over an existing 4x4 Wood Post. The Inground Post does NOT slip over an existing post as it is designed to go directly into dirt. The Surface Mount Post is designed to slip over a standard 4 × 4 wood post. It can also be bolted to concrete or another appropriate solid surface using the correct anchors for that material.
Which mounting post is right for my mailbox?
Start with the surface where the mailbox will be installed. Choose the Inground Post for lawn or similar ground material, the Surface Mount Post for concrete or an existing standard 4 × 4 wood post, and the Dual Mount Post when two mailboxes need to sit side by side.
If you already have a wood post, the Surface Mount Plate lets you reuse it. Choose the Dual Mount Plate when you need a shared support for two mailboxes on one compatible post.
What is the difference between an Inground Post and a Surface Mount Post?
The Inground Post installs directly into lawn or similar ground material for a new curbside foundation. The Surface Mount Post bolts to concrete or slips over an existing standard 4 × 4 wood post, so it can be installed without digging a new post hole.
Is the Surface Mount Plate included with the Inground Post?
Yes. The Surface Mount Plate is already included with the Inground Post. Purchase the standalone plate when you want to mount an Adoorn mailbox setup to the top of an existing standard 4 × 4 wood post.
What is the Dual Mount Post used for?
The Dual Mount Post supports two side-by-side Adoorn mailboxes on one in-ground foundation. It is designed for neighboring addresses, shared curbside locations or any installation that needs two mailboxes presented as one coordinated setup.
What is the difference between the Dual Mount Post and Dual Mount Plate?
The Dual Mount Post creates a complete in-ground support for two side-by-side mailboxes. The Dual Mount Plate, listed as the Dual Mounting Post Spreader Bar on the product page, is the shared crossbar that mounts two Adoorn mailboxes on one compatible post.
Do these mounting products work with Adoorn Post Mount Mailboxes?
Yes. These posts and plates are designed for Adoorn post mount mailbox installations. Match the mounting product to the installation surface and the number of mailboxes you need to support, then review the product page and installation instructions before ordering.
Are Adoorn mounting posts made for outdoor use?
Yes. Adoorn mounting posts are built for outdoor mailbox installation and designed to remain sturdy through changing weather. Secure installation and the correct anchors or foundation are essential for long-term performance.
What should I check before installing a mailbox post?
Confirm the delivery location, installation surface, property lines and any local placement requirements before starting. Follow the instructions for the selected post or plate, use fasteners and anchors suited to the surface, and make sure the finished mailbox is stable and easy for the carrier to reach.