Data from the 2010 Census and Census 2000 present information on the population reporting more than one race and enable comparisons of this population from two major data points for the first time in U.S. decennial census history. Overall, the population reporting more than one race grew from about 6.8 million people to 9.0 million people. One of the most effective ways to compare the 2000 and 2010 data is to examine changes in specific race combination groups, such as people who reported White as well as Black or African American—a population that grew by over one million people, increasing by 134 percent—and people who reported White as well as Asian—a population that grew by about three-quarters of a million people, increasing by 87 percent. These two groups exhibited significant growth in size and proportion since 2000, and they exemplify the important changes that have occurred among people who reported more than one race over the last decade.

This report looks at our nation’s changing racial and ethnic diversity. It is part of a series that analyzes population and housing data collected from the 2010 Census and provides a snapshot of the population reporting multiple races in the United States. Racial and ethnic population group distributions and growth at the national level and at lower levels of geography are presented.

This report also provides an overview of race and ethnicity concepts and definitions used in the 2010 Census. The data for this report are based on the 2010 Census Redistricting Data (Public Law 94-171) Summary File, which was the first 2010 Census data product released with data on race and Hispanic origin and was provided to each state for use in drawing boundaries for legislative districts.