Ghost Counties is Jan Willem Tulp’s winning submission to the Eyeo Datavisualization Challenge (using 2010 US census data).
The visualization depicts the number of homes and vacant homes for all the counties for each state. The size of the outer bubble represents the total number of homes, the size of the inner bubble represents the number of vacant homes. The y-axis shows the population size (on a logarithmic scale) and the x-axis of the bubbels shows the number of vacant homes per population. Each bubble is also connected with a line to another axis: the population / home ratio.
