Choropleth Map

Regions are colored by a variable. Be careful with your color choices, as they can quickly change what the map shows.

Tutorials and Guides

Examples

Splitting the US population evenly, with arbitrary shapes

By Engaging Data, this interactive map shows various splits of the United States…

Where restaurant chains dominate

Researchers Xiaofan Liang and Clio Andris estimated the percentage of restaurants that are…

Country-wide housing shortage

Emily Badger and Eve Washington for NYT’s The Upshot show how the housing…

Where there is more livestock than people in the United States

The United States Department of Agriculture provides annual inventory data on livestock, crops,…

Interest levels for political issues mapped

To estimate public interest in the many political issues across the United States,…

Map of Russian gas exports

Speaking of Russian gas, Josh Holder, Karl Russell and Stanley Reed for The…

Delaying motherhood

The New York Times mapped birth rates, which are down almost everywhere, especially…

Where People are Married and Not

About 48% of the U.S. population aged 15 and older is married. I was curious if there were regional variations, so I mapped it.

Where coronavirus cases are peaking

With this simple choropleth map, Lauren Leatherby for The New York Times shows…

Design your own election scenario

As we have seen, small shifts in voting behavior of various demographic groups…

Racist housing policy from 1930s and present-day temperature highs

Brad Plumer and Nadja Popovich for The New York Times show how policies…

Distribution of unemployment at the tract level

We’ve been hearing a lot about national unemployment rate, but it’s not uniformly…

Where people are wearing masks

NYT’s The Upshot ran a survey through the data firm Dynata asking people…

Map of Foreign Students

There are over 1 million international higher-education students enrolled in the United States. This map shows where they reside.

Racial Divide

It's hard to think of much else. These maps show the racial divide between black and white people in major cities.

Choosing color palettes for choropleth maps

Choropleth maps, the ones where regions are filled with colors based on data,…