Largest Ancestry: 2000
This is one of my favorite demographic maps. It was produced by the Census Bureau to show the most commonly reported ancestry for each county in the United States in 2000. Even though the data is over 13 years old, the map remains very popular.
Since a follow-up map for 2010 has not been produced yet, I thought it would be more than worthwhile to create this map using Census American Community Survey data.
Largest Ancestry: 2010
The methodologies used in making the 2000 and 2010 ancestry maps are similar, but there is one important alteration in the 2010 map. Ancestries that can be logically grouped together were combined so they might be better represented on the map. For example, Scandinavian ancestries: Norwegian, Danish, Swedish and Finnish, are very common in the Upper Midwest. Individually, they are the most popular ancestries in only a few counties, but when grouped together, Scandinavian is the most common ancestry in over 70 Upper Midwest counties.