USPS-Approved Mailboxes in Colorado

USPS-Approved Mailboxes in Colorado Cluster & Pedestal Multi-Family Options

U.S. Mail Supply supplies USPS‑approved multi-family mailbox systems across Colorado. We offer cluster box units (CBUs), pedestal-mounted mailboxes and other centralized solutions for apartments, condominiums and multi-unit developments. All units meet USPS specifications. Check with your local postmaster to confirm installation details in your jurisdiction.

Colorado-specific mailbox requirementsGet help from a rep!
Black Mail Package Drop

Mail Package Drop

PEDESTALS SOLD SEPARATELY

Product # US4375

$570.00

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In-ground pedestal for USPS Approved Mail Package Drop

Mail Package Drop/Mail Chest In-Ground Pedestal

PEDESTALS SOLD SEPARATELY

Product # US4385

$170.00

Call For Pricing on 3+ units!

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Traditional Decorative 8 Tenant Door Cluster Box Unit

Florence 8 Tenant Cluster Mailbox (CBU) Traditional Decorative w/ Pedestal #1570...

PEDESTALS SOLD SEPARATELY

Product # 1570-8V2

$3,050.00

Call For Pricing on 2+ units!

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1590T2 Florence Outdoor Pedestal Parcel Mailbox USPS approved

Florence 4 Unit Outdoor Parcel Locker w/ Pedestal #1590-T2

PEDESTALS SOLD SEPARATELY

Product # 1590T2

$2,970.00

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16 Door USPS & Courier Cluster Mailbox Unit 1570-16-SD

Florence 16 Tenant Cluster Mailbox (CBU) w/ Pedestal #1570-16

PEDESTALS SOLD SEPARATELY

Product # F181570-16

$2,350.00

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35 Door Horizontal Mailbox: The 1400-75 Florence 4B+

Front-Loading Horizontal Mailboxes – 35 Doors

PEDESTALS SOLD SEPARATELY

Product # 1400-75

$3,150.00

Call For Pricing on 5+ units!

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4-Door 3500 Series Vertical Mailbox Aluminum

4-Door 3500 Series Vertical Mailbox

PEDESTALS SOLD SEPARATELY

Product # 3504

$483.00

Call For Pricing on 4+ units!

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Double Letter Locker Collection Box in Tan

Double Letter Locker Collection Box-Front Access

PEDESTALS SOLD SEPARATELY

Product # LL2FCUSTOM

$1,596.00

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Multi-Family Mailboxes for New Property Developments in CO

Colorado’s growing multi-family housing market demands reliable, USPS‑compliant mail delivery systems. Centralized mail solutions like STD‑4C mailboxes or CBUs help developers meet postal standards while offering secure, efficient access to mail and parcels.

U.S. Mail Supply supplies mailbox systems designed for new 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 CO

Mailbox regulations in Colorado 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 Colorado 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
    CDOT’s mailbox support standard requires supports using steel pipe (e.g., 1¼″ diameter) with angle connectors, mounted with correct anchoring.
  • Mailbox Placement
    Supports shall adhere to CDOT’s standard spacing and mounting requirements. Supports should not impede sidewalk or roadway clearance.
  • Locking & Parcel Delivery
    Locking mailboxes are permitted if USPS‑approved. Deposit slots must accept letters and unfolded Priority envelopes. CBUs must comply with parcel locker rules under STD‑4C.
  • ADA Compliance
    In centralized installations, at least one tenant compartment must be no higher than 48 inches AFF. Parcel lockers must start at least 15 inches above the floor. Arrow‑locks should fall between 36 and 48 inches AFF.
  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.
*See the USPS National Delivery Planning Standards: A Guide for Builders and Developers for more information.

Fastest Growing Multi-Family Property Investments in Colorado

Multi-family development in Colorado continues to surge, especially around Denver, Aurora, Boulder and the northern corridor. Developers are focusing on high-density urban infill, transit-oriented residential projects and mixed-use developments with residential, retail and amenity spaces. This growth emphasizes the need for centralized mailbox infrastructure designed to serve dense, modern communities.

Other Colorado cities are also making major strides in the multi-family sector:

  • Fort Collins’ multi-family development is driven by population growth and proximity to Boulder.
  • Colorado Springs is expanding with new apartment communities as the city grows eastward.
  • Greeley is showing an increased demand for affordable housing near commuter routes.

As Colorado’s urban areas grow, U.S. Mail Supply supplies USPS-approved mailbox systems engineered for multi-unit environments.

Fastest Growing Multi-Family Property Investments in Colorado
Top Multi-Family Property Management Firms in CO

Top Multi-Family Property Management Firms in CO

Colorado’s fast-growing rental market has given rise to several prominent multi-family property management firms. Property management firms play a key role in maintaining apartment communities, coordinating with developers and upholding USPS mailbox standards across Colorado. From Denver to Boulder and beyond, they help streamline operations for property owners and tenants alike.

Colorado Realty and Property Management Denver

Colorado Realty manages multi-family and residential properties across Denver, Colorado Springs, Fort Collins and surrounding areas. They provide full-service leasing, maintenance and owner support.

Pioneer Property Management

Pioneer specializes in multi-family property management across Denver, Boulder, Fort Collins and Greeley. They handle operations, tenant relations and community management.

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 Colorado. 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 Colorado Multi-Family Properties In:

  • Denver
  • Colorado Springs
  • Aurora
  • Fort Collins
  • Lakewood
  • Thornton
  • Arvada
  • Westminster
  • Pueblo
  • Centennial
  • Boulder
  • Greeley
  • Longmont
  • Loveland
  • Broomfield
  • Grand Junction
  • Castle Rock
  • Commerce City
  • Parker
  • Littleton
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Don't worry, we can help you figure out what's best and most cost efficient for your space. A representative at U.S. Mail Supply will help you figure out what is required for USPS or private delivery, the number of units you need and any information required for installation.

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