If your state* uses MarketMaker, here’s a searchable database that allows you to see consumer food purchasing data at the county level. Here’s an example from Ohio.
(Or by going to http://www.ohiomarketmaker.com and clicking on MarketResearch.)
To populate regional food preferences data on the map:
1.) From the main page in the green Market Research box, click the “down arrow” by the word “where.” Choose “Food Preferences.” Then you’ll see numerous variables on the dropdown sub menu. Choose “Average Food at Home Expenditures,” for example.
3.) The next dropdown gives you the choice to select the entire state, or narrow down to one or more by “County.”
4.) Click “Mapt It!” to see your results
5.) Overlay the shaded data with a Business Search (farmers markets, groceries, restaurants, etc.) if desired.
The food preference data is compiled from ESRI who gets their data from Bureau of Labor Statistics. Here is a link to the information.
Picture by Quatarmion’s Mind Dump used under Creative Commons license