More than half of the nation’s 3,143 counties contain a plurality of people who describe themselves as German-American, according to a Bloomberg compilation of data from the Census Bureau’s 2010 American Community Survey.

Click on the graphic  to explore the results of the survey and see the distribution of other heritages across the country. Select an ancestry from the menu on the left to see its concentration, county by county, then choose one from the right to compare their relative prominence in a region.