From the description on FlowingData's website:
"The map shows these ratios. The more bars, the darker the brown and the more grocery stores, the darker the green. It's kind of what you'd expect, but now you can really see that high bar concentration in Wisconsin, whereas a lot of the country has at least three times more grocery stores.
From a per capita perspective, Wisconsin has the third highest rate with about 8 bars per 10,000 people. North Dakota and Montana take the one and two spots at 9.9 and 8.6 bars per 10,000 people, respectively. Delaware, Maryland, and Mississippi have the lowest rates, all with under 1.5 bars per 10,000 people."
See full article on FlowingData.com.