First of all, one of the most important things to understand about National Change of Address is that the USPS-built matching logic is intentionally very strict. The USPS controls both the matching logic & the data, and the names and addresses in your list must match the USPS data or there won't be a match. The wisdom behind the strictness of the USPS matching logic is that it is deemed far better to not give a new address if there is suspicion of it being wrong, rather than giving it and having it be wrong. Our strict matching logic is a very good thing.

Furthermore, whether or not you receive new address information from National Change of Address depends on a number of factors, a few of which include: the relocating postal customer must actually have filed a change of address; the relocating postal customer must also provide accurate information that corresponds with your data; the length of time since the change of address was filed; etc. Also, the demographic and geographic makeup of your list and the quality of the data in your list will affect the results of the NCOA processing. Generally speaking, the better your input data, the better your results.

I get it. So what can effect my NCOA match rate?

Before your file can be processed all addresses in your list undergo our robust 2-tier USPS standardization. This processing adds the correct Zip+4 to your addresses. However some of your addresses may lack the basic ingredients needed to match the USPS Zip4 file. Addresses that can't be standardized cannot be run through NCOA. It's that simple: if certain addresses in your list can't be appended with Zip+4, those addresses cannot be put through the NCOA matching process. Usually ZIP + 4 match rates run in the 93% to 98% range. The match rate is different for each list, of course and it depends largely on your data.

So why do some addresses fail Zip4 standardization?

• The data submitted may not be precise enough to narrow the address down to a single ZIP + 4 area. (e.g., "125 MAPLE" is submitted and both "125 N MAPLE ST" and "125 S MAPLE ST" are valid addresses in two different ZIP + 4 areas.)
• The data submitted is not sufficiently standard for that area. (e.g., "1010 CENTENNIAL BLDG" is submitted where the Postal Service recognized address is "125 E 3RD ST SUITE 1010".)
• The data submitted by the local Post Office is not complete.

What else can impact my NCOA match rate?

• You may receive an incorrect ZIP+4 code and incorrectly standardized address. For most lists this is a rare occurrence but it is not uncommon on business lists that have many vanity addresses.
• Example: The data submitted is not standard for the intended destination but similar to that for another destination. (e.g., "1010 PILLSBURY CTR" (Pillsbury Center is a building and the suite number is 1010), is submitted and "1010 PILLSBURY DR" falls within the same ZIP.)

Ok, anything else?

You may not receive change of address information when someone has actually moved. National Change of Address processing will yield new addresses for many of the people and companies that have moved and filed address changes with the USPS, but some will be missed because of the strictness of the NCOA matching logic (and, yes, it's designed to be that strict). In this sense, the information you receive from NCOA will depend on the accuracy of the name and address information in your file and also the information filed by the relocating postal customer.

• Examples:
• The name and address you submitted may be substantially different than the address change filed by the addressee. (e.g., The addressee submitted a change as "MARY G. SMITH-JONES", "125 MAPLE ST APT 125" and you submitted "M SMITH", "125 MAPLE ST". In this example, the last name, middle initial or address will cause a miss.)
• Addressee may not have filed a change of address with the USPS.
• When mail carriers submit "Move - No Forwarding Address" cards they rarely have complete information. (For example, if the carrier enters the information in a way that does not match the way you have it, it may not result in a match due to the strictness of the NCOA matching logic.)
• The addressee may have moved too recently to appear on the NCOALink file. It takes 2-4 weeks for a change to appear on the NCOALink file.
• In some cases, individuals intentionally enter information on their Change of Address card that is unlike their actual name resulting in a non-match. (Example: T. Smith-Jones instead of Tom S. Jones).

Ok. What else can go wrong?

You may receive a new address from the USPS matching logic when the addressee has not moved at all. As strange as that sounds, it happens. Fortunately, these tend to appear in small numbers but do happen every once in awhile.

• Examples:
• Someone in a household filed a change of address incorrectly. (e.g., A child when moving out of parents' house submitted a "Change of Address" card indicating a family move. Therefore, when you do a search on the kid's dad, you're told he has a new address.)
• Someone filed a "Change of Address" with the old and new addresses in the wrong place on the card. (In other words, they just didn't fill out the form correctly. It happens.)

Got it. Anything else I should know about?

Yes. In rare cases, you may receive an incorrect new address from the USPS matching logic when the addressee has moved. These tend to appear in small numbers fortunately. Here's why.

• Someone has moved multiple times during the 48 month timeframe and the moves could not be linked or chained together. National Change of Address will attempt to link multiple moves providing back the newest address as long as each move filed contains complete address information and all move types are the same. (e.g. If an apartment number is included in one move and omitted in the next move, the link cannot be made.)
• Two moves are filed from the same household under the same surname, one family move and one individual move or two family moves. The incorrect new address may be returned, although matching requirements exist to prevent this.