A 2009 study by the Department of Agriculture found that 2.3 million households do not have access to a car and live more than a mile from a supermarket. Much of the public health debate over rising obesity rates has turned to these “food deserts,” where convenience store fare is more accessible—and more expensive—than healthier options farther away. This map colors each county in America by the percentage of households in food deserts, according to the USDA’s definition. Data is not available for Alaska and Hawaii.
Click here for map.
The map in the link is teh suck. The legend and map colors differ. There are some interesting observations and anecdotes in the comments at the link though, including some additional links that might be interesting.
Fwiw, the map of low food access areas by census block group might be interesting or useful. South Memphis is not as barren as I would have presumed (although I haven’t looked at mapping closely regarding methodology, data sources, etc.). The map can be found at the trfund.com website.