The size of the points is used to convey the information about number of deaths where smaller the size, less number of deaths.
Different colors are used so that all the points are visible.
Hover over each point, to get the information for particular county.
You can also search for a specific city by the input tab provided.
Click on reset to redraw all the points.
Data for the above map is taken from Slate which can be downloaded from here. Slate Data
This data is from Dec, 2012 - Dec, 2013.
The visualization is done with the help from following sources: