From this page you can download spreadsheet data files on racial and ethnic diversity for all states, metropolitan areas, micropolitan areas, counties, and places. Each row of a data file contains a geographic unit’s identifiers and its total population, racial-ethnic group counts and percentages, and diversity index score in 1980, 1990, 2000, and 2010. Column headings provide descriptions of these variables.
For more information about the types of data available, click here.