Bivariate Choropleth

A bivariate choropleth map is a thematic map where areas are shaded according to two variables. It's typically used to visualize both the correlation between the two variables and their geographic patterns.

Due to the complexity of reading such a map, the number of classes for each variable is usually limited to no more than four. To assist the reader to better understand the data insights, a scatter plot or two univariate choropleth maps are usually added alongside the bivariate choropleth map.

Below is a reproduction of a bivariate choropleth map showing United States diabetes and obesity prevalence by county in 2020. A scatter plot of these two variables are added to show the details of the classification by quantiles.