I think this tool will allow you to find the VISA merchant classification, but you will need to know the location of the business and (perhaps) their real name which might be different than their trade name:
http://visa.via.infonow.net/locator/...tLoadAction.do
The tool is really designed to the opposite (find a particular type of merchant), but I suspect you can play with it for this purpose.
Thanks mia for posting that.
It looks like I am missing the 5% bonus on grocery store from the Freedom card, on a supermarket in our area, despite it is listed on the Visa site as GROCERY STORES/SUPERMARKETS/BAKERIES -5411 - so I am going to send Chase a SM on the missing bonus. Since it is a few hundreds pts missing, I think it is worth the effort to follow up - give Chase the specific charges / dates and ask it to investigate.