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CASS & NCOA

Address-List Cleanup

CASS/NCOA Address Clean-up

Verification to Increase Deliverability

LetterStream’s address-list cleanup (CASS & NCOA) service verifies, corrects, and standardizes your mailing addresses against official USPS data—including ZIP+4, delivery point validation, and change-of-address updates for people who have moved. By cleaning your list before you mail, we help you cut returned mail, lower postage and processing costs, and improve compliance as a trusted print-to-mail partner.

Address-List Cleanup

Coding Accuracy Support System

As Low as $19.95 Plus $.005 Per Name

  • Flagging or removing duplicate records

  • Correcting Street and City spelling

  • Adding Zip +4 digit zip codes

  • Standardizing abbreviations

  • Formatting addresses to meet USPS standards

Now you can reduce the cost of your mailing and improve deliverability by requesting that we clean your mailing address list for you.

We can also provide Delivery Point Validation. This process determines whether the house or street number associated with a street address falls within the range of house numbers that exist for that specific street.

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National Change of Address (NCOA) 

As Low as $29.95

Plus $.008 Per Name

For even greater deliverability, ask for NCOA (National Change of Address) information. With this process we can determine if any of the individuals on your mailing list have moved in the last 18 months and provide you with their new address. When someone moves and has a postal address change that information is logged in the US Postal Service change of address system and we can provide you with their new or updated postal address.

Whether you have an active mailing that you are working on or not, you can still benefit from having correct and up-to-date addresses.

Returned Mail is Expensive!

  • Reduced Costs for Mailings

    Bad addresses can be removed so you won’t pay the cost for pieces that won’t be delivered.

  • Reduce Costs for Return Processing

    Chances are someone in your organization has a stack of returned mail that, someday, they will attempt to correct in your software. Using our service will not only reduce the cost of this process, but will assure you that it is taken care of.

  • Improve Compliance

    If you are required to notify individuals or at least give it a best efforts try, it will be important for you to have your list professionally corrected.

  • Be Green

    Literally tons of paper and envelopes are produced each year, printed, mailed, flown and driven around the country, returned and then deposited in the trash.

There are many benefits of keeping your mailing list accurate, standardized and up-to-date.

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Getting Started

Many organizations don’t properly clean their address lists because it’s simply too complicated and time-consuming for most people.

We have attempted to take the frustration out of the process by allowing you to send your data to us for quick and timely processing.

Strategies for address clean up may include:

  • Clean list before each mailing

  • One-time list cleanup if reusing the same list

  • Clean up list at regular intervals prior to mailing

Send USPS Mail and FedEx

Fast, Secure Print-to-Mail Service with USPS and FedEx

Frequently Asked Questions

Address-List Cleanup is a pre-mailing service that verifies and standardizes your address list to USPS requirements. We offer two levels of cleanup: CASS (Simple Address Cleanup) and NCOA (Deluxe Address Cleanup)

CASS (Coding Accuracy Support System) verifies and formats the addresses you provide so they meet USPS standards. It can fix formatting issues, correct city spelling, and add ZIP+4 when the address is valid. 

NCOA (National Change of Address) includes everything CASS does, plus it updates addresses for recipients who have moved within the last 18 months.

CASS standardizes and verifies what you already have. NCOA does that and replaces outdated addresses with the most recent USPS change-of-address data (when available).

CASS (Simple) costs $19.95 base
+ $.005 per recipient.

NCOA (Deluxe) costs $29.95 base
+ $.008 per recipient.

CASS will convert text to uppercase, compress/standardize address lines, correct city spelling, and add ZIP+4 for valid addresses. It won’t add missing recipient names or company fields.

Yes. Both CASS and NCOA include DPV, which checks whether the specific delivery point exists at that address (not just the street).

Your cleaned CSV includes a DPV column. The first character tells you status: Y = fully confirmed, D = primary confirmed but missing secondary, S = primary confirmed but secondary unconfirmed, N = not confirmed, blank = not processed.

Upload a properly formatted CSV with recipient name/company already present, plus street address, city, state, and ZIP. Cleanup won’t insert missing names or companies.

Cleanup typically completes quickly, within 10 minutes.

You get a downloadable CSV showing your updated/standardized addresses and status fields (including DPV), plus a results legend in your account so you understand each outcome.

Use CASS when your list is relatively fresh but needs USPS formatting and ZIP+4 accuracy. Use NCOA when your list might be stale or you want the highest deliverability by catching recent movers.

It greatly improves accuracy and reduces returns, but delivery still depends on real-world factors (vacant properties, restricted locations, brand-new moves not yet reflected, etc.). NCOA provides the strongest improvement because it also updates recent movers.

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