USPS-Approved Mailboxes in California
Cluster & Pedestal Multi-Family Options
U.S. Mail Supply provides USPS-approved multi-family mailboxes
throughout California. We offer durable, high-quality options for new
developments and multi-unit housing projects. Our cluster box units
(CBUs), pedestal mailboxes and other solutions meet USPS regulations for
secure, centralized mail delivery. Always check with your local
postmaster for specific installation guidelines.
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 CA
California’s growing multi-family housing market demands reliable, secure mail delivery solutions. USPS-approved mailboxes provide convenient access for residents while meeting postal regulations in new developments.
U.S. Mail Supply offers durable mailbox systems ideal for apartment buildings, townhomes and condominiums. Our cluster and pedestal mailboxes are built for longevity and simple 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 CA
Mailbox regulations in California 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.
USPS Mailbox Requirements
Placement and Height
Mailboxes in California must be installed 6 to 8 inches back from the curb, 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 the flag side of the mailbox 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.
Parcel Locker Ratio
In multi-family housing, there must be at least one parcel locker for every five mailbox compartments in new installations.
California-Specific Mailbox Requirements
Mailbox Supports
Locking Mailboxes
In California, locking mailboxes are permitted and increasingly popular for added security. All locking mailboxes must be USPS-approved, with slots large enough to accept normal daily mail and unfolded Priority envelopes. USPS carriers do not accept mailbox keys and will not open locked boxes, so the design must allow easy mail deposit without carrier access to the lock.
Building Codes
Multi-family projects must meet California Building Code and USPS mailbox standards. No single statewide code applies to all developments.
Americans with Disabilities Act (ADA) Compliance
Accessible compartments must be 15–48 inches above the floor for forward/side reach per ADA guidelines.
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 California
Multi-family housing continues to shape California’s urban landscape, with several cities leading the nation in new apartment and condo development. No metro is embracing this trend more aggressively than San Diego-Chula Vista-Carlsbad, which ranked #3 among large metros nationwide; an impressive 73.4% of all new housing units built there in the most recent year were multi-family. This surge reflects both population growth and strong demand for walkable, amenity-rich living environments among young professionals and downsizing retirees.
Other California cities are also making significant strides in the multi-family sector:
- San Jose-Sunnyvale-Santa Clara ranks #5 among large metros, with 67.3% of new construction classified as multi-family.
- Los Angeles-Long Beach-Anaheim follows closely, with 60.9% of new units being multi-family-placing it firmly among the top ten large metros nationwide.
- San Francisco-Oakland-Berkeley rounds out California’s leaders, with 60.0% of new housing built as multi-family.
With California ranked #11 overall in the U.S. for new multi-family housing development, the state remains a top destination for investors, developers and property managers seeking high-growth, high-demand markets. If you’re managing or investing in multi-family properties in San Diego, San Jose, Los Angeles or other rapidly growing California metros, now is the time to explore our mailbox solutions.
Top Multi-Family Property Management Firms in CA
Several top property management firms in California are driving multi-family housing growth, overseeing everything from luxury apartments to large townhome communities. U.S. Mail Supply offers a wide selection of USPS-approved mail delivery systems, trusted by top firms for reliable, compliant mailbox solutions-whether for cluster mailboxes in city developments or pedestal units in suburban neighborhoods, meet tenant needs and enhance property appeal.
Good Life Property Management
Dedicated to simplifying property ownership, offering services such as tenant screening and maintenance for multifamily properties.
Harland Property Management
Provides multifamily property management services, focusing on maximizing property value and unique properties.
Glaser Property Management
Highly rated for its comprehensive property management services in Los Angeles.
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 California. 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 California?
USPS does not sell mailboxes. In California, you can purchase USPS-approved mailboxes from U.S. Mail Supply, hardware stores or specialty retailers. Both residential and commercial options are available, including centralized and wall-mounted units.
What mailboxes are approved by USPS in California?
Any mailbox marked “Approved by the Postmaster General” and “U.S. Mail” is valid. All boxes must meet federal USPS standards. Local communities may have additional requirements, so check with your local post office before installing.
How do I get a new mailbox in California?
Buy a USPS-approved mailbox from a retailer and install it according to USPS guidelines. For new construction or replacements, check if the mailbox meets placement and size standards.
Can I customize my mailbox in California?
Custom mailboxes are allowed if they meet USPS standards for size, visibility and construction. Get approval from your local postmaster before installing a custom box.
How do I install my California mailbox?
Curbside mailboxes must be 6–8 inches from the curb and 41–45 inches above the ground. Posts should be sturdy and buried less than 24 inches deep. For wall-mounted or centralized mailboxes (like STD-4C or CBUs), follow USPS and ADA guidelines and consult your local post office.
Can I get private mail delivery in California?
Private carriers (UPS, FedEx, Amazon) deliver in California, but only USPS can use your USPS mailbox. Private delivery boxes can be installed separately for non-postal deliveries.
Can a California property owner create a custom mail service?
Businesses, universities and multi-family properties can set up custom mail services if they comply with USPS STD-4C and ADA regulations. Centralized mailbox systems must meet accessibility and security standards.
USPS-Approved Mailboxes for California Multi-Family Properties In:
- San Diego
- Sacramento
- Fresno
- Oxnard
- Santa Rosa
- Ventura
- Santa Clarita
- Riverside
- Chico
- Bakersfield
- Inglewood
- Redding
- Burbank
- Costa Mesa
- Stockton
- Huntington Beach
- Simi Valley
- Torrance
- Lodi
- El Monte
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