“Test your knowledge of the relative populations of different geographic areas by participating in the Census Bureau’s version of  “March Madness.” The Census Bureau’s Population Bracketology is an interactive data visualization allowing you to fill out your own bracket based on comparisons of state and metro area population. The objective is to pick the larger population between two metro areas or states and see how close you can come to a perfect score. At the end, visitors can mouse over the choices to see the actual population numbers or view the data table. The population statistics used in the matchups come from the Vintage 2014 population estimates. Other data visualizations can be viewed in the Census Bureau’s online gallery.”