I had no idea that America had such a German ancestry!

The 'Ancestry from US Census 2000' report is part of a series that presents population and housing data collected by Census 2000, where 80 percent of respondents to the long form specified at least one ancestry. (About one-sixth of households received the long form.) It presents data on the most frequently reported ancestries and describes population distributions for the United States, including regions, states, counties, and selected cities.

The listed ancestries were reported by at least 100,000 people, and the numbers cited in this report represent the number of people who reported each ancestry either as their first or second response.

Read the 'Ancestry from US Census 2000' report (PDF link)