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Population density is the number of persons living
within a unit of land area. The number of people (on
average) living on a square mile of land would be
a measure of population density. It is most frequently
calculated by dividing the population of a specific
geographic area (such as a county) by the surface
area.
The map above shows the population density per
square mile for counties in West Virginia.
It is one of a large number of interesting maps that
can be found in the West
Virginia Health Status Atlas, a website maintained
by the West Virginia Department of Health and Human
Resources.
The West Virginia map above uses counties as enumeration units. However the world map above has dots position in relation to the number of people in a smaller area. It gives a more accurate representation of the distribution of people rather than an average by county or country. For a closer look see this world population density map enlarged.
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