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AVS is just one of several fraud management tools business owners can use to help safeguard against credit card fraud. In some cases, a merchant may ask for your ZIP code before you have selected your method of payment. The merchant could be gathering marketing data for their sales team.

The first six crosswalk files are used to allocate ZIP codes to Census Bureau geographies such as census tracts, counties, county subdivisions, Core Based Statistical Areas (CBSAs), CBSA Divisions, and Congressional Districts. The last six are used to allocate from those same Census Bureau geographies to ZIP Codes.

Stores want your ZIP code because, combined with your name from your credit card, they can use it to find out other information about you from commercial databases, like your full mailing address. They may even sell the information to data brokers, who sell it to other marketers.

Actually, zip code 99999 doesn't even exist. In fact, the highest real zip code is 99950, for Ketchikan, Alaska. Still, if you scour your database, there's a good chance you'll find more than a few 99999 zip codes. Most organizations find that it's been entered as a placeholder in their shipment database.

Your zip code isn't Important alone but the more slip ups you have the more likely any one person has enough to use. He can find out the average wealth of the people in that zip code, and use that information to figure out whether it's likely to be worth his time to continue scamming you.

It is more difficult to get a certain exact address by zip code. First of all, five zip codes correspond to the delivery post office, which will be divided into large delivery areas and delivery routes. A nine-digit zip code will usually lead to a more precise location, but it rarely corresponds to a unique address.

(Making you key it in serves as an added security measure to foil a thief who doesn't know the numbers.) But it's usually unnecessary at brick-and-mortar stores, so just say no. And your ZIP code certainly shouldn't be posted on social media or other public websites.

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