Postal Regulations
Download USPS regulations and mailbox standards.
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Postal Regulations Quick Links Guide
Download our convenient quick guide for U.S. Postal Service regulations that includes all of the information, links and documents below.
Centralized Mail
U.S. Postal Service Regulations
The following links and documents include important information about U.S. Postal Service Regulations related to centralized mailbox requirements and standards.
Please note that the USPS updates standards and information periodically. Always check with your local Postmaster before proceeding with mail center projects.
USPS requires mailboxes to be upgraded to currently approved standards when any remodeling or renovation occurs to the property. (See Section 632.621)
A list of all USPS approved mailboxes and approved manufacturers can be found in the latest Postal Bulletin which is published bimonthly.
Contact USPS
Find Your Local Post Office
Contact your local postmaster to review your centralized mailbox project plans. Always explain that you are looking for centralized mailbox planning guidance when contacting your Post Office as the personnel assigned may vary.
USPS Guidelines
USPS Regulations Governing Centralized Mailboxes
Official USPS bulletins and federal guidelines for centralized mail planning.
See important information regarding customer and carrier accessibility and plan your CBU installation according to USPS standards.
NDCBUs are no longer supported for any continued centralized mail delivery service. All reasonable efforts must be made to identify all NDCBUs still in service and get them replaced as quickly as possible.
The Federal Register is not regularly updated – refer to the Postal Operations Manual and National Delivery Planning Standards Guide published by the USPS for current regulations for planning your mail center. Details related to a 2020 change in the mail compartment to parcel locker ratios can also be found here: 2020 Change to 4C Mailbox to Parcel Locker Ratio Requirements
The U.S. Postal Service requires a 1:5 ratio (one parcel locker for every five mailboxes) on mailbox installations.
For additional information, view Section 5 of the USPS Delivery Planning Guide for Builders and Developers or refer to the postal publication linked below.
Find Additional Resources
Tools for Industry Professionals
Quickly locate the information you need for your centralized delivery mailboxes project with our curated industry toolkits and comprehensive resources library.
