Proportional Map

This is an example of a proportional map. It uses circles to reflect the population's size by district. The circles are set to scale to show the difference between large and small populations, i.e: the larger the circle then the larger the population and the smaller circles are less populated.

http://www.neighbourhood.statistics.gov.uk/HTMLDocs/images/BP%2520Maps5_tcm97-50745.jpe