Top 9 Mailboxes for Outside Large Capacity – Post-Mount Mailboxes

As an Amazon Associate I earn from qualifying purchases.

1. ShoppingOnBed


11.69in. W x 14.98in. H x 24.82in. L, Extra Large Mailbox, Mailboxes for Outside Post Mount, SoB Extra-Large Black Galvanized Steel Post-Mount Mailbox, Black Locking Mailbox

ShoppingOnBed #ad - Security: non-locking; capacity: 3175 cubic in. Weight:11. 5 lbs. W x 14. 98 in. The expansive body measures 11. 69 in. D. Mounting bracket and hardware sold separately. H x 24. 82 in. Heavy-duty galvanized steel construction provides strength, stability and resisting rust. Extra-large capacity fits multiple packages, boxes, and padded envelopes, packages and boxes. Approved by the United States postal service postmaster general. Mailbox features a durable ribbed body and powder coat paint finish that adds strength and resistance against weathering.
BrandShoppingOnBed #ad
ManufacturerShoppingOnBed #ad
Height14.98 Inches
Length24.82 Inches
Weight1 Pounds
Width11.69 Inches
Part NumberLarge Mailbox #1
ModelMailbox posts for outside #1



Black, Large, Architectural Mailboxes 8950B-10 Chadwick Postmount Mailbox

ARCHITECTURAL MAILBOXES #ad - Cast aluminum handle. Durable galvanized steel for longevity. Steel reinforced opening resists abuse. Mailbox measures 21 in. X 8. 8 in. X 6. 61 in. Fully powder coated inside and out.
ManufacturerArchitectural Mailboxes #ad
Height8.94 Inches
Length21.06 Inches
Weight4.62 Pounds
Width6.61 Inches
Part Number8950B-10
Warranty1 year limited lifetime warranty.



Architectural Mailboxes 950020B-10 Centennial Postmount Mailbox, XL, Black

ARCHITECTURAL MAILBOXES #ad - Predrilled 4 in. X 5. 5 in. Larger inner compartment can accept a usps priority mail large flat rate box 12 in. Hole pattern in floor allows for mounting to existing post installation hardware not included. X 12 in. And still has room for additional mail and parcels. Sleek magnetic door closure provides reliability all while keeping door firmly closed. X 12 in. Heavy gauge galvanized steel body equipped with stainless steel door pins then fully powder coated for corrosion resistance. Mailbox measures 18 in. X 10 in. X 14 in.
ManufacturerArchitectural Mailboxes #ad
Height11.93 Inches
Length18.35 Inches
Weight14.08 Pounds
Width14.17 Inches
Part Number950020B-10
Warranty1 year limited lifetime warranty.



Large, White, Architectural Mailboxes 7900W-10 MB2 Post Mount Mailbox

ARCHITECTURAL MAILBOXES #ad - Reinforced door bracket for added rigidity. X 8. 8 in. Predrilled 4 in. X 10 in. X 11 in. Mailbox measures 206 in. Classically shaped in a refreshed design with embossed door and side panels provide a place for house numbers to be applied. Mounting holes in floor allows for easy installation. Front access door opens wide to allow for easy mail removal.
ManufacturerArchitectural Mailboxes #ad
Height10.63 Inches
Length20.47 Inches
Weight100 Kilograms
Width8.58 Inches
Part Number7900W-10
Warranty1 year limited lifetime warranty.



KYODOLED Wall-Mount Mailbox,Large Capacity Mail Box,Galvanized Steel Rust-Proof Metal Post Box,Mailboxes for Outside,15.75"x9.44"x4.72" Black

KYODOLED #ad - Modern & stylish look: post box with cover unique residential Mailbox. Mail box with elegant and modern design, it is environmentally friendly paint, which is prefect to decorate the exterior of the house.

Also, so it isn't harmful to the body. Easy installation: mail drop box has pre-drilled holes, It is simple and quick. Should be installed under eave, everything you need for installation is in the box, awning or porch. Appropriate capacity: mail box fits hold multiple letters, newspapers, etc. Emails, including rolled magazines. Rust prevention : the painted finish is rust-resistant to withstand the elements, prevent scratch-resistant. Size: 15. 75"x9. 44"x4. 72". High-quality, durable: mailboxes are made of strong galvanized steel, this product will provide long-term durability and use for years.
ManufacturerGTlight #ad
Height9.44 Inches
Length15.75 Inches
Width4.72 Inches



Extra Large, Architectural Mailboxes 6900RZ Elephantrunk Parcel Drop Box, Rubbed Bronze

ARCHITECTURAL MAILBOXES #ad - Retrieval door equipped with pry-resistant 3-point lock system with 2 keys. Leave parcels behind the outgoing partition for pick up by carrier. Bolts securely to the ground. Rotating drum design accepts large parcels. Equipped with a yellow "No Deliveries" indicator.
ManufacturerArchitectural Mailboxes #ad
Height37.2 Inches
Length16 Inches
Weight33 Pounds
Width17.8 Inches
Part Number6900RZ

7. Jssmst


Black, Locking Mailboxes Wall Mounted Vertical – Jssmst Key Lock Drop Mail Box Medium Capacity Galvanized Steel Cover Rust-Proof Metal Post Box, 12.6 x 8.5 x 3.4 Inch, SM-0601L

Jssmst #ad - Heavy duty and weatherproof: Crafted with quality galvanized steel for strength and durability. Security with key lock: Jssmst mailbox includes key lock with 2 keys for security against theft. Easy installation: jssmst mailbox includes pre-drilled holes, mounting screw and an instruction for easy installation. Exterior dimentions: 12. 6 x 8. 46 x 3. 35 inch; inside storage area measurES: 12. 4 x 8. 3 x 3. 05 inch. Powder coated protect mails from heavy rain. Large capacity: jssmst mail box can hold magazine and large envelopes, it is able to hold days worth of mail at a time.
BrandJssmst #ad
ManufacturerJssmst #ad
Height12.6 Inches
Length8.5 Inches
Weight3.36 Pounds
Width3.4 Inches
Part NumberSM-0601L

8. Gibraltar Mailboxes


ADM11B01, Post-Mount Mailbox, Gibraltar Mailboxes Admiral Medium Capacity Aluminum Textured Black

Gibraltar Mailboxes #ad - Fully assembled with pre-drilled side and bottom mount patterns. Rust-proof aluminum provides protection from weather and salt. Patented door design keeps rain out and maximizes durability. Specially reinforced body brace increases strength. Match with gibraltar Mailboxes posts with the designation letter A. Textured, powder-coated finish keeps like new. 60% thicker material than most standard mailboxes. Recommended with aluminum mounting hardware sold separately.
BrandGibraltar Mailboxes #ad
ManufacturerSolar Group, Inc. #ad
Height9.5 Inches
Length20.8 Inches
Weight2.6 Pounds
Width6.9 Inches
Part NumberADM11B01

9. Gibraltar Mailboxes


Gibraltar Mailboxes Stanley Extra-Large Capacity Galvanized Steel Black, Post-Mount Mailbox, ST200B00

Gibraltar Mailboxes #ad - Black powder-coated finish provides resistance against outdoor elements. Match with any Gibraltar mailbox post with the designation letter code D. Mailbox is completely assembled and ready for use. Ribbed body enforces extra strength and stability. Engineered with rust-resistant galvanized steel for extended endurance. Extra large size provides 3, 175 cubic inches of space to receive letters, padded envelopes and multiple boxes simultaneously. Door latch and outgoing mail flag can be adjusted for a tighter grip. Mounting hardware is not included.
BrandGibraltar Mailboxes #ad
ManufacturerSolar Group #ad
Height15.83 Inches
Length24.69 Inches
Weight11.5 Pounds
Width11.56 Inches
Part NumberST200B00
Warranty90 day.