I found an interesting online tool called the Food Environmental Atlas that generates maps based on your criteria.
In the Local Food category, this is the map for the Percent of Farms with Direct Sales (the darker colors represent a higher percentage).
The next map is the Number of Farmers Markets. Again the darker the colors represent more markets.
I find it interesting that there are fewer direct sales and fewer farmers markets in regions that I thought were more agricultural. Perhaps everyone there has their own farm?
Anyway, it’s a very neat tool and there are lots of other categories. It also lets you drill down to the state level. I would like to be able to overlay a few categories…