USPS-Approved Mailboxes in Washington

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.

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
Multi-Family Mailbox Solutions

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 dwellings.

It's essential to consult with local authorities or the local postmaster to comply with any additional regulations or standards specific to your area.

  • 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 clearly display the address number, with numerals at least 1 inch high, placed on the front or flag side for visibility.
  • 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.
  • 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.
  1. 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.
  2. Mobile or Trailer Home Developments
    Permanent developments must have permanent lot assignments, public road maintenance and typically use centralized, curbside or sidewalk delivery as determined by USPS. Transient developments receive mail at a single USPS-approved location, with park staff handling internal distribution.
  3. 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.
  4. 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.

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 major 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.

Fastest Growing Multi-Family Property Investments in Washington
Top Multi-Family Property Management Firms in WA

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 Property Management

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

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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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