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"All Things FSS"
The USPS® is deploying a new technology that will boost efficiencies in the processing, distribution, and delivery of flats–the Flats Sequencing System (FSS). FSS will automatically sort flat-sized mail into delivery point sequence at high speeds. The efficiencies gained by employing FSS are influencing many changes within both the Postal Service® and the mailing industry.


Flats Sequencing System (FSS)
Stand Alone Mail Prep (SAMP)
Flats Sequencing System (FSS)
Stand Alone Mail Prep (SAMP)


FSS Locations Map
Map of 47 FSS Sites and Number of Machines

Flats Strategy
USPS Corporate Flats Strategy

Flats Addressing Requirements
Latest information regarding flats addressing

Flats Mail Prep & Entry
Mail preparation and entry information associated with FSS

Flats Presentations & Communication Resources
FSS presentations and communication tools

FSS Deployment Information
**** UPDATED – July 30, 2013 ***** The most current FSS deployment information including: FSS locations, deployment schedules, operational sites, and FSS zones.

FSS Frequently Asked Questions (FAQs)
Questions and Answers associated with the Flats Sequencing Strategy

Contact Information:

Important Updates

The "Heartbleed" bug hasn't affected Postal Service websites that require customers to provide usernames and passwords, according to USPS IT and the Corporate Information Security Office (CISO). To learn more information, click here.


Standard Mail DSCF Load Leveling Final Rule Published in the Federal Register

The Postal Service has released its Federal Register final rule revising the service standards for Standard Mail that is eligible for Destination Sectional Center Facility (DSCF) rates. These changes will allow a more balanced distribution of DSCF Standard Mail across delivery days. With its new rules, USPS is extending delivery expectation to four days for mail entered on Friday and Saturday. National Implementation began April 10, 2014.


January 2014 Price Change Fact Sheets


Getting Started with Full-Service Intelligent Mail


PostalOne! Contingency Plan

For mailers unable to submit electronic information, click here for the PostalOne! Contingency Plan.











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