These locking mailboxes share one design decision and differ in nearly everything else: all 234 products in the collection lock, and they sort here by the door each lock answers. Three subfamilies carry the catalog: Locking Cluster Mailboxes for tenant rows, Locking Commercial for public-facing drop boxes and vaults, and Locking Residential for pedestal units and in-wall boxes at the home scale. Around them sit the 3500 Series vertical walls, the staff-loaded private lines, and the secure vaults. Fourteen finishes and four marking options run across the range, from a $422 three-door vertical to a $2,328 double letter locker.

Locking Mailboxes for Tenant and Staff Doors

Most locks in this collection guard a door only its owner or staff should open. Locking Cluster Mailboxes split into front-loading and rear-loading rows for shared tenant collection, and Locking Residential breaks the same idea down to house scale with Residential Cluster Pedestal Units and Residential In-Wall Units. Indoors, the 3500 Series verticals run 3 through 7 doors per wall; the 3-door model (#3503) lists at $422.00 and the 4-door (#3504) at $563.00, with call-for-pricing at four or more units. The private-use 1600 and 1700 Series extend the same logic to walls loaded by building staff, 21 to 60 doors at a time. Whatever the scale, the pattern is one tenant lock per compartment and one key per household or desk.

Public Drop-Off Locks: Vaults and Letter Lockers

The other half of the collection faces outward, taking what the public leaves. The “Collection” Vault, formerly the Secure Collection Unit, lists at $1,095.00 with a free shipping tag, and the “Deposit” Delivery Vault sits at $1,035.00; both move to call-for-pricing at two or more units. The Ballot Box Vault (#DVCS0019) handles ballots and deposit slips at $1,245.00. The letter locker line scales from the Arrow Letter Locker at $465.00 to the Double Letter Locker Collection Box double-door front-access unit at $2,328.00, with single and double doors and front-only or front-and-rear access, so the public side stays sealed while staff empty from behind. For envelope-only drops, see Letter Drop Boxes.

Fourteen Finishes, Four Marking Options, One Ladder of Sizes

Breadth is the quiet advantage of shopping at this level instead of a child category. The finish filters list Black on 164 of the 234 products and White on 163, with Sandstone at 158 and Dark Bronze and Postal Grey at 153 each; Antique Bronze and both speckled finishes sit near 129, Anodized Aluminum covers the private walls at 56, and the rare ones, Tan, Gray, and Bronze, live in single digits to low teens. Marking options, decals plus standard, white-fill, and black-fill engraving, apply to 144 products. The box-count ladder runs from single-box units through fifteen compartments with ten more counts beyond, which makes matching an existing wall a filter exercise. Outdoor rows continue in Outdoor Mailboxes and Vital F-Series Cluster Box Units.

Start at the Subcategory, Finish at the Cart

Three routes sort this range faster than its filters. Locking Commercial, 20 products, holds the letter lockers and vaults for offices and municipal fronts. Locking Cluster Mailboxes carries the tenant rows, and Locking Residential keeps the house-scale line. Neighboring collections deepen two of those routes: Locking Apartment Mailboxes holds 178 models for multifamily lobbies, and Outdoor Mailboxes lists 30 CBUs and parcel lockers for entrance rows. For carrier rules see USPS Approval and Commercial Mailboxes. On pricing, call-for-pricing thresholds start at two units across the vaults and CBUs, four on the smaller verticals, and five on the private walls; member discounts land in the cart, and the site’s match-or-beat policy covers most competing quotes.

Why Choose US Mail Supply for Your Locking Mailbox?

At US Mail Supply, we are more than just a retailer; we are mailbox experts dedicated to helping you find the perfect security solution. Here’s why thousands of customers trust us:

• Unmatched Expertise: With years of experience, our team understands the nuances of mailbox security and regulations. We’re here to answer your questions and guide you to the right choice.
• Extensive Selection: We offer one of the largest collections of locking mailboxes online, from residential to commercial, ensuring you’ll find the perfect style and security level for your needs.
• Commitment to Quality: We only stock mailboxes from reputable brands known for their durability and reliability. Your security is our priority, and we stand by the quality of every product we sell.
• Dedicated Customer Support: Your satisfaction is our goal. We provide exceptional support before, during, and after your purchase to ensure a seamless experience.
• Great Value: We offer competitive pricing and Free Shipping on orders over $99, making it more affordable than ever to secure your mail.

Frequently Asked Questions About Locking Mailboxes