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United States Postal Service Mailbox Regulations and Specifications



4C Centralized Mailbox Regulation Information
How the US Postal Service STD-4C Regulation affects Centralized Mailbox Selection
- standard required for new construction
  (Effective October 2006)
US Postal Service STD-4C Specification Information
- applies to 4C Horizontal Mailboxes
  (Specifications that all 4C mailboxes must meet)
United States Postal Service Information
USPS Standard 4C (PDF)
- For new construction and replacement information
  of existing equipment
USPS Standard 4B/4B+ (PDF)
- applies to 4B/4B+ Horizontal and Vertical Mailboxes
  (Standard for replacement and/or retrofit installations effective
  October 2006)
USPS Standard 7C (PDF) - applies to Curbside Mailboxes
  (Effective September 2015)
Americans with Disabilities Act (ADA) Information
ADA Compliance Guidelines – for 4C Horizontal Mailboxes         (Click here for PDF version)

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