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For Ultimate Mailing Efficiency and Postal Discounts

Your mailing list is one of your most valuable assets. Each year returned or undeliverable mail cuts into company profits; it’s estimated that a single piece of returned mail costs an average of $3. Verify your addresses are correct and complete using the most accurate, up-to-date address data available with our DSF2 processing service. With over 165 million records, the DSF2 database contains every USPS® deliverable address in the U.S. The database (which we use as a reference for processing) also contains vacant, residential, business, or seasonal address information.

A significant feature of DSF2 – walk sequence codes, allow you to deliver mail pieces in the exact order the mail carrier travels – qualifying you for USPS Enhanced Carrier Route (ECR), Basic, High Density, or Saturation postal discounts.

Our DSF2 processing service also distinguishes between residential and business addresses, and identifies if mail delivered to an address will go to a curb-side mailbox or door slot – critical information you can use to obtain the best parcel shipping rates.

DSF2 identifies whether a ZIP + 4® coded address is currently represented in the USPS delivery file as a known address record. DSF2 processing is one of the approved methods outlined in the Domestic Mail Manual (DMM®) for sequencing mail pieces in walk-sequence order when not using a simplified address.


  • Qualify for maximum postal discounts
  • Target your mailings
  • Speed postal processing with highest level of verified addresses


  • Over 165 million records (every USPS® deliverable address in the U.S.)
  • Validates address to actual delivery point
  • Postal coding and delivery/walk sequence numbers
  • CASS Processing
  • Address standardization
  • Identifies delivery types such as curb, door slot, box, etc.
  • Deliverable & undeliverable postal addresses
  • Distinguishes between business vs. residential addresses
  • Commercial mail receiving agencies (CMRA)
  • Seasonal addresses
  • Addresses vacant for more than 90 days

Records Processed

Price per/K

Up to 100,000


100,000 - 500,000


500,000 - 1 Million


1 Million+

Call 1-800-635-4772

The minimum order per file is $175.00. Pricing reflects files of 20 fields or less. Please call for pricing on files larger that 20 fields.

Required Fields:

Address; City; State; 5-digit ZIP Code

Returned Fields:

Click here to view the returned fields

DFS2® Demographic Append Services

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Melissa Data
The leading international provider of data quality and address verification software. Melissa Data's affordable, easy-to-use solutions for data cleaning and deduplication can be used separately or together to provide full global data quality. Melissa Data specializes in Microsoft .NET and SQL Server Integration Services, IBM, Java and Oracle environments with APIs, Web services and enterprise plugins that empower batch and real-time applications. Melissa Data also provides a full line of direct marketing solutions including mailing software, list hygiene and data append services, and a comprehensive line of mailing lists and sales leads.