Current Regulations applicable to residential and commercial mailbox installations

Regulation Description
USPS Standards 7C  Applicable to all curbside mailbox installation - Effective September 2015
USPS Standards 4B/4B+ Applicable to all 4B/4B+ both Vertical and Horizontal Installations (New, replacement and/or retrofit) - Effective October 2006
USPS Standards 4C Applicable to all new and replacement installations