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Computerized Delivery Sequence (CDS)

The CDS program provides updated delivery sequence information on customer-provided address lists.

Who is CDS for?

Eligibility for the CDS update service is determined through the Address Sequence Service process described in the Domestic Mail Manual (DMM) 507.

First Class Mail
Standard Mail



Customers qualifying for CDS will benefit from the use of the CDS file through:

  • Complete and accurate addresses
  • Reduced undeliverable-as-addressed mail
  • Increased deliverability
  • Access to walk sequence saturation discounts
  • Ability to identify addresses marked as vacant or seasonal

The CDS product is distributed to qualified customers on a bi-monthly or weekly basis.

To establish a CDS account, customers must complete the CDS Customer Application and Web Access Form. Mail or fax (650-357-6741) the completed forms to the CDS Department at the NCSC.

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Featured Resources

CDS Conversion Software

CDS Samples

Related Products

Electronic Address Sequencing (EAS)

EAS provides an electronic option for processing address files for sequencing and/or qualification for Computerized Delivery Sequence (CDS).


For more information about CDS, contact the National Customer Support Center at 1-800-238-3150 or email

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