Classed choropleth maps show areal units that are combined into a smaller number of groups and portrayed in intervals. In the map above, the areal unit is the county and there are 4 classification intervals. This map shows the percentage of Muslim residents across the United States and there is a vast area without any Muslim residents reported. The number of intervals and the ranges they represent are an important part of the classed choropleth map. With too many intervals, the reader may overlook patterns. With too few intervals, no useful information will be communicated. The way the data is divided up within these intervals is also crucial. Some data is best suited for intervals with an equal quantity of values in each, while others are better fit for intervals that are equal in range but not amount of values within the range. Even still, some sets of data call for natural breaks, where the data values are divided based on trends in them.
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