As part of an initiative to increase access to fresh and healthy food the United States Department of Agriculture (USDA) has launched a new online tool highlighting the nation’s food deserts. These are defined as census tract areas with poverty rates of at least 20%, where at least a third of residents live more than one mile from a supermarket (10 miles in rural tracts).
The USDA has mapped out the 6,500 census tracts falling into this category (shown in pink), along with various other statistics, such as access by age group and households without a vehicle.
Check out the interactive map on the USDA website (Flash required). The USDA also provides the raw data for download.