Gibraltar Mailboxes Rural Post-Mount Mailbox — Black, Galvanized Steel, Extra-Large ST200B00

Gibraltar Mailboxes extra-large rural mailbox for post-mount installation

The Gibraltar Mailboxes ST200B00 is an extra-large rural mailbox built for residential curbside and driveway use. Its 3175 cubic-inch interior accepts multiple padded envelopes, standard letters, and medium-sized packages without overfilling — a practical solution for households that receive both regular mail and parcel deliveries daily. The classic arched profile echoes traditional rural mailbox designs while delivering the structural performance modern homeowners expect. Fully assembled at the factory, the ST200B00 is ready to mount the moment it arrives, with no loose hardware to manage.

Galvanized steel construction with powder-coated black finish

The ST200B00 is built from galvanized steel, where a zinc coating bonds at the molecular level to block rust from forming beneath the surface. A ribbed body pattern reinforces the walls against denting and deformation, keeping the mailbox's shape intact over years of outdoor exposure. The exterior carries a powder-coated black finish that outperforms standard paint in adhesion, UV stability, and impact resistance — properties that matter for a fixture facing daily weather cycles. Together, the galvanized core and powder coating create a two-layer protection system designed for long-term outdoor durability.

Extra-large mailbox for packages with adjustable door latch and outgoing mail flag

At 3175 cu-in, the ST200B00 comfortably holds multiple large packages alongside everyday letter mail, reducing missed-delivery notices and carrier return trips. The door latch is field-adjustable for a tighter or looser grip, letting you calibrate the closure to local wind conditions or carrier access preferences — a thoughtful detail that most standard mailboxes skip entirely. An aluminum outgoing mail flag is included, signaling to carriers that mail is ready for pickup without requiring a trip to the curb. The mailbox ships fully assembled, so no additional hardware or preparation is needed before mounting.

Post-mount installation compatible with Gibraltar mailbox post models

The ST200B00 is engineered for post-mount installation and is officially compatible with Gibraltar's BP000B01 and BP000W01 mailbox post models, making it a natural upgrade for existing Gibraltar post setups. The standard mounting footprint also accommodates many universal aftermarket metal and wood posts, broadening installation options. Because the mailbox arrives fully assembled, setup is limited to securing the box to the post — a task most homeowners complete in under fifteen minutes without specialized tools. Whether replacing an aging rural mailbox or establishing a new curbside station, the ST200B00 integrates cleanly into virtually any post-mount configuration.

Frequently asked questions

Q: Is the Gibraltar ST200B00 USPS approved for curbside use? The ST200B00 is a standard rural mailbox designed for residential curbside mail delivery. Verify current USPS postal regulations for your delivery type and local requirements before final installation.

Q: What mailbox posts are compatible with the ST200B00? It is officially compatible with Gibraltar BP000B01 and BP000W01 post models. Many standard universal post systems with a conventional mounting footprint are also compatible — check your post specifications before purchasing.

Q: Does the ST200B00 come pre-assembled? Yes — it ships fully assembled from the factory. No tools or additional hardware are required to prepare the mailbox itself; you can proceed directly to mounting it on the post.