Hey moc11,
Glad to see that there is someone else trying to find the same info and having similar results. After posting this message, I did a lot of digging and did find those two sites...and they do not give you a really great way to search places by zoning...that would be too easy! haha
I actually called and spoke with a few zoning representatives in detail. From what I was told, there is not a designation for a DSP in Baltimore County (nor did the guy know what a DSP was). There are designations for breweries and wineries, but nothing specifically for distilleries.
This doesn't mean that you can't have a distillery in Baltimore County...just that you have to cut through a bit more red tape to get it approved.
Are you from Baltimore originally?
If I find out any other information that might make it easier, I will pass it along...it seems that we are traveling down the same road at the same time. I was thinking of joining the Maryland Distillers Guild. Are you a member or thinking of joining?