Explanation

In the US, 14 percent of the population, 25 and older, has not graduated high school. The map above shows what counties are above that average and what counties are below, in accordance with their population size.

Source

The information displayed above comes from the American Communities Survey, 2013 5 Year Estimates which is published by the US Census Bureau. These figures can be found on Table S1501 at http://factfinder.census.gov/.