Bivariate choropleth study, poverty and inequality in Maryland

A study of using color to encode two variables at once, on a bivariate choropleth map. (Bivarite: two variables. Choropleth: a map where the color of areas represents information about those areas.)

map of Maryland

This map shows the poverty rate and Gini index for census tracts in Maryland. The Gini index is a measure of inequality. A low Gini index indicates relative equality, while a high Gini index marks relative inequality.


Data come from the American Community Survey 5-Year Estimates (2016–2020).

map of Baltimore

Baltimore City and surrounding areas of Baltimore and Anne Arundel counties.

map of the DC suburbs

Suburbs north of D.C., Montgomery County and parts of Howard and Prince George's.