USPS-Approved Mailboxes in Washington
Cluster & Pedestal Multi-Family Options
U.S. Mail Supply delivers USPS-approved multi-family mailboxes
across Washington. Our products offer long-lasting, dependable solutions
for multi-unit housing and new construction projects. We carry cluster
box units (CBUs), pedestal-mounted mailboxes and other centralized
delivery options in line with USPS guidelines. Always confirm local
installation requirements with your postmaster.
Mail Package Drop
Mail Package Drop/Mail Chest In-Ground Pedestal
Florence 8 Tenant Cluster Mailbox (CBU) Traditional Decorative w/ Pedestal #1570-8V2
Available Finish options
Postal Grey
Dark Bronze
Black
White
Forest Green
Sandstone
Florence 4 Unit Outdoor Parcel Locker w/ Pedestal #1590-T2
Available Finish options
- Postal Grey
- Dark Bronze
- Black
- White
- Forest Green
- Sandstone
Florence 16 Tenant Cluster Mailbox (CBU) w/ Pedestal #1570-16
Available Finish options
- Postal Grey
- Dark Bronze
- Black
- White
- Forest Green
- Sandstone
Front-Loading Horizontal Mailboxes – 35 Doors
Available Finish options
Anodized Aluminum
4-Door 3500 Series Vertical Mailbox
Available Finish options
- Sandstone
Bronze
Aluminum
Double Letter Locker Collection Box-Front Access
Available Finish options
- Black
- White
Tan
Gray- Bronze
Multi-Family Mailboxes for New Property Developments in WA
Washington’s expanding multi-family housing market demands reliable mail delivery systems. USPS-approved mailboxes offer secure, centralized delivery for residents while aligning with postal regulations in new developments.
U.S. Mail Supply provides dependable mailbox systems suited for apartments, townhomes and condominiums. Our cluster and pedestal mailboxes deliver long-term durability and straightforward installation.
U.S. Mail Supply Has Multi-Family Mailbox Solutions For
- Apartment Complexes
- Condominiums
- Townhome Communities
- Student Housing
- Senior Living Facilities
- Military Housing
- Public Housing Authorities
- Mixed-Use Developments
- Affordable Housing Projects
- Property Management Companies
- Real Estate Developers
- New Multi-Family Construction Projects
- Renovation & Retrofit Projects
- HOAs (Homeowners Associations)
- Section 8 and Government-Sponsored Housing
Requirements for Multi-Family Mailboxes in WA
Mailbox regulations in Washington are primarily governed by the United States Postal Service (USPS) standards, local municipal codes and specific requirements for multifamily dwelling.
It’s essential to consult with local authorities or the local postmaster to comply with any additional regulations or standards specific to your area.
USPS Mailbox Requirements
Placement and Height
Mailboxes in Washington must be installed 6 to 8 inches back from the curb or road edge, with the bottom of the mailbox or mail entry point positioned 41 to 45 inches above the ground or road surface.
Address Visibility
Each mailbox must visibly display the address, with numbers at least 1 inch tall, located on the front or flag side of the box.
Cluster Box Units (CBUs)
For new construction or major renovations, USPS requires the use of STD-4C Horizontal Mailboxes or Cluster Box Units (CBUs). The highest tenant lock must be no more than 67 inches above the finished floor and the lowest must be at least 28 inches above the finished floor.
Parcel Locker Ratio
In multi-family housing, there must be at least one parcel locker for every five mailbox compartments in new installations.
Washington-Specific Mailbox Requirements
Mailbox Supports
Mailbox posts on state roads must follow Washington State Department of Transportation (WSDOT) standards, using steel supports anchored with anti-twist plates or V-wing sockets. Decorative, plastic or unapproved posts are not allowed. All supports must meet crashworthiness requirements.
Locking Mailboxes
Locking mailboxes are allowed in Washington if USPS-approved. Slots must be large enough for daily mail and unfolded Priority envelopes. Since carriers don’t carry keys, designs must allow easy mail deposit without unlocking the box.
Building Codes
Multi-family housing developments must comply with USPS STD-4C mailbox standards and any applicable local building codes. Approved systems include secure parcel lockers, tenant compartments and master locks.
ADA Compliance
Mailbox installations must follow ADA reach range guidelines. Curbside boxes should be 41–45 inches off the ground and set 6–8 inches from the curb. Centralized units must have at least one compartment below 48 inches, with parcel lockers at least 15 inches off the floor.
Requirements by Property Type
Site-Constructed Single-Family Developments
Developers must coordinate with the USPS during the design phase, as centralized mail delivery with secure parcel lockers is the standard for new communities. If new homes are within one block of existing ones, they may adopt the same delivery method pending USPS review; otherwise, current centralized delivery standards apply.
Mobile or Trailer Home Developments
Apartment Communities
Use USPS-approved 4C centralized mailbox units with at least one parcel locker per five mailboxes, installed near main entrances and accessible to carriers. Outdoor units require USPS approval, must avoid streets or sidewalks and include a canopy with lighting and weather protection.
Student Housing & Off-Campus Dormitories
USPS delivers mail in bulk to a designated representative for distribution within dormitories, with no individual mailbox delivery provided. Dormitories—defined by shared living spaces—require early coordination with a USPS Growth Manager and may need named designees to accept mail.
*See the USPS National Delivery Planning Standards: A Guide for Builders and Developers for more information.
Fastest Growing Multi-Family Property Investments in Washington
Washington continues to see strong momentum in multi-family housing,
with urban centers like Seattle and Spokane leading development across
the state. Driven by rising demand for dense, walkable communities,
developers are capitalizing on shifting demographics and changing
lifestyle preferences. Seattle remains a standout, ranking among the
top metros nationwide for new apartment construction and attracting
both domestic and international investors. Spokane and Tacoma are also
expanding quickly, thanks to growing job markets and increasing demand
for affordable rental options.
Other Washington cities are also making significant strides in the multi-family sector:
- Seattle-Bellevue-Everett ranks among the top 15 U.S. metros for apartment completions, fueled by tech-sector growth and strong in-migration.
- Spokane-Spokane Valley continues to expand its multi-family housing inventory, supported by public investment and regional job creation.
- Tacoma-Lakewood is benefiting from Seattle’s housing pressure, drawing both renters and developers to its growing urban neighborhoods.
As multi-family development accelerates throughout Washington, U.S. Mail Supply offers mailbox solutions designed to meet the needs of developers, property managers and tenants, combining USPS compliance with modern convenience in high-demand markets.
Top Multi-Family Property Management Firms in WA
Leading property management companies in Washington are transforming the multi-family housing landscape, from upscale high-rises in Seattle to expanding suburban communities in Tacoma and Spokane. U.S. Mail Supply delivers secure, USPS-approved mailbox systems statewide, including cluster box units for dense urban projects and pedestal-mounted options for growing residential developments, helping guarantee reliable mail delivery and tenant satisfaction.
Blanton Turner
Blanton Turner manages a diverse portfolio of multi-family residences, student housing, high-rise apartments and commercial spaces across Seattle. Known for an innovative, people-centric approach and customized service to each property.
Umano is a trusted, full-service property manager specializing in multi-family buildings across Seattle, Everett and Lynnwood. They emphasize thorough tenant screening, responsive 24/7 support and tech-enabled property operations.
Choose U.S. Mail Supply for Your Multi-Family Mailbox
- USPS Compliance Guaranteed
- Constructed With High-Quality Materials
- Custom Design & Sizing Options
- Nationwide Delivery Network
- Woman-Owned Business
- Installation Support
- USPS & Unit Quantity Guidance
- Volume Discounts
- Solutions For Every Multi-family Property Type
Equip your multi-family development with the best USPS-approved mailboxes in Washington. Contact U.S. Mail Supply today for a consultation and to explore our range of cluster, pedestal and other mailboxes for multi-family properties.
USPS-Approved Mailbox FAQ
Where can I buy mailboxes in Washington?
USPS does not sell mailboxes. In Washington, you can purchase USPS-approved mailboxes from U.S. Mail Supply, hardware stores or specialty retailers. Options include residential, commercial, centralized and wall-mounted units.
What mailboxes are approved by USPS in Washington?
Any mailbox marked “Approved by the Postmaster General” and “U.S. Mail” meets USPS regulations. Local jurisdictions may have additional requirements, so check with your post office before installing.
How do I get a new mailbox in Washington?
Purchase a USPS-approved mailbox and install it according to USPS standards. For new installations or replacements, confirm the mailbox meets placement and sizing guidelines.
Can I customize my mailbox in Washington?
You may use a custom mailbox if it meets USPS size and visibility standards. Always get approval from your local postmaster before using a non-standard box.
How do I install my Washington mailbox?
Curbside boxes must be 6–8 inches from the curb and 41–45 inches above the ground. Posts should be secure and buried less than 24 inches deep. Follow USPS and ADA rules for wall-mounted or centralized mailboxes (like STD-4C or CBUs).
Can I get private mail delivery in Washington?
Private carriers (UPS, FedEx, Amazon) deliver in Washington, but only USPS can place items in a USPS mailbox. Install a separate delivery box for non-postal services if needed.
Can a Washington property owner create a custom mail service?
Yes. Businesses, universities and multi-family properties can install custom mail service setups if they meet USPS STD-4C and ADA standards. Centralized mail systems must be secure and accessible.
USPS-Approved Mailboxes for Washington Multi-Family Properties In:
- Seattle
- Spokane
- Tacoma
- Vancouver
- Bellevue
- Kent
- Everett
- Renton
- Federal Way
- Spokane Valley
- Yakima
- Kirkland
- Bellingham
- Kennewick
- Auburn
- Pasco
- Marysville
- Redmond
- Sammamish
- Lakewood
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