Charting Metro Diversity

Interesting news from my favorite Texas city, according to this story the Houston Chronicle

The Houston region is now the most ethnically diverse large metropolitan area in the country, surpassing New York City.

Two suburbs - Missouri City and Pearland - have become even more diverse than the city of Houston. Other suburbs aren’t far behind.

This chart compares the demographics of cities in the Houston area: 

This chart compares the largest metro areas in the country: 

Read the full report, which compared the number of demographic groups and their relative size, here [PDF].

A ‘Radical’ View of DC’s Demographics

I’ve been obsessed with William Rankin’s ‘radical cartography' site for more than a year. One map in particular — a detailed view of Washington, D.C.’s segregated neighborhoods — has stuck with me more than others over time.  

The map used 2000 Census data to show how black residents are clustered in northeast and southeast neighborhoods, while white residents live in the northwest. He also mapped poverty, income, crime and education — creating a stunning series of images about inequality in the city.

I don’t have Rankin’s cartography skills, but I’ve tried my best to update his race map, using similar colors and features, with the 2010 Census data. First, this map shows concentrations of black residents, who made up roughly half the city’s population in 2010, down 10 percentage points from the previous decade: 

This map shows where Hispanic residents are clustered: 

Here’s another version with all major race/ethnicity groups. The dots represent 25 residents per U.S. Census block: 

All the data used to make the maps can be download here

Mapping Mobility

The U.S. Census Bureau today released a report on geographic mobility based on data from the American Community Survey: 

The comparison of data on state of residence in 2010 to data on state and region of birth reflects the cumulative effect of long-term patterns of migration. Fifty-nine percent of people in the United States were born in their state of residence. However, there is significant geographic variation.

Seventy percent of people in the Midwest, for example, live in the same state as their birth. While just under half the people in the West remained in their birth states. The West, by the way, has the highest proportion of foreign-born residents: 20 percent, according to the report.

Here’s a state-by-state map: 

Charting Marriage, Education

Lately I’ve been experimenting with bubble charts in R based on Nathan Yau’s great tutorial. In this case, I wanted to see the relationship between higher education and marriage among women by state. 

Some states — such as Idaho, Utah and Wyoming — have both high marriage rates and low higher education rates. But that really says more abou those states than whether marriage and higher education correlate. Washington, D.C., for example, has the highest higher education rate and the lowest marriage rate. 

Still, it’s fun to see how states compare. View a larger version here

Data source: U.S. Census Bureau, American Community Survey

How The American Diet Has Changed Since 1980

Thanks to the U.S. Census Bureau, I learned this week that Americans eat on average about 21 pounds of rice each year — and they wash it down with about 13 pounds of ice cream, apparently.

I wondered, what else do Americans eat, and how has that changed over time? Using the bureau’s “Per Capita Consumption of Major Food Commodities" report, I created this treemap, which visualizes hierarchical data structures that have categories and subcategories.

Red meat, for example, is a category of food that consists of beef, lamb and mutton, pork and veal. The same goes for sweeteners: sugar, corn sweeteners and high-fructose corn syrum. And so forth. 

Thanks to Many Eyes, the treemap shows which categories of food are consumed at the highest volumes, and also the proportion of the various sub groups. It also shows how that consumption has changed over time.

This view shows category and food volumes by sizes and change with colors (orange represents growth; blue represent declines): 

Right click on a category to zoom in and isolate it on the map. Doing so on sweeteners, for example, shows that we still consume lots of them (173 pounds a year on average), but that sugar consumption has declined by 22 percent since 1980. (That’s largely because it’s imported and expensive). We also see that high-fructose corn syrup consumption has increased 180 percent. (That’s largely because it is widely used as a sugar substitute in processed foods and soft drinks). Hovering over the foods to see values: 

Go check out the interactive version, which is easier to understand. Experiment with views by switching the “Category” and “Commodity” tags at the top of the map. You can also change the years to examine change over shorter periods of time. 

Download data |  Source: U.S. Census Bureau

Note: The treemap only includes data for food products measured in pounds, not gallons (milk) or pints (cream). 

Mapping American Poverty

A national map prompted by today’s news about Americans in poverty: 

WASHINGTON — The portion of Americans living in poverty last year rose to the highest level since 1993, the Census Bureau reported Tuesday, fresh evidence that the sluggish economic recovery has done nothing for the country’s poorest citizens. 

View larger version

Source: American Community Survey | Previously: Children in Poverty

WaPo Census Map

The Washington Post has an excellent county-by-county interactive map that visualizes three decades of U.S. Census Bureau data. The page opens with a national view of the population in 2010 by race/ethnicity, but also allows several other views by decade.

Here’s the national view, with colors representing which group has a plurality in each county, and shades indicating the concentration: 

More recent data shows other information collected last year by the bureau. This view, for example, is a national look at the percentage of residents who are married with kids in the home (notice Utah and South Texas — counties with the nation’s highest birth rates — have a greater proportion of these residents):

And, finally, if you zoom in, the map displays data at the block group level. Here’s D.C., which as I’ve noted is quite segregated:

America’s ‘Youngest’ Counties

In recent weeks the U.S. Census Bureau released more detailed demographic profiles obtained during the 2010 count. Unlike redistricting data, which was released earlier this spring, the demographic profiles break out the population by specific age categories.

This map shows more than 3,100 U.S. counties (or county equivalents, like parishes) with the percentage of population that is younger than age five. As you can see, there’s wide divergence across the country, but some western states — Utah, Arizona, Texas, the Dakotas and Alaska — have several counties with a large percentage of young residents: 

I suspect it’s because these states, for a variety of factors, including religion, just have higher birth rates. Here’s the view by state: 

Download data

Migration to Texas 2009-10

On my work blog this morning I posted three maps visualizing new U.S. Census data on how many people moved into and out of Texas at some point between 2009. 

This map shows net migration to and from Texas by state, with darker shades of green representing higher numbers of residents who left their respective states for Texas. Darker reds represent states that received more Texans than they exported: