To properly display a numerical comparison is an important role many maps find in today's society. One method of comparison is to take different sizes of circles proportional in size to a range of numbers. For example, a value of 100 could be represented with a smaller circle while a value of 1000 could be represented by a larger circle. This proportional circle map shows circles representing houses built before 1940 still in existence in the year 1990, all of which are located around states in the Midwest United States. Clearly California has many more than nearby Nevada, as it has 1,250,000 homes represented as compared to 15,000 homes represented.
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