Top 15 Ancestry Groups in the United States as of 1990 - In millions - percent of total population
http://www.census.gov/
German 23%
 58 million
Irish
 16%
 39 million
English
 13%
 33 million
Afro-American
 10%
 24 million
Italian
 6%
 15 million
American
 5%
 12 million
Mexican
 5%
 12 million
French
 4%
 10 million
Polish
 4%
 9 million
Am. Indian
 4%
 9 million
Dutch
 3%
 6 million
Scotch-Irish
 2%
 6 million
Scottish
 2%
 5 million
Swedish
 2%
 5 million
Norwegian
 2%
 4 million

 "In 1990, the most frequently reported ancestry in the United States was German. Nearly one-fourth of the American people (58 million) considered themselves to be of German or part-German ancestry.

The next largest ethnic groups in rank order were Irish, English, Afro-American, and Italian. In all, 33 different ancestry groups had at least 1 million people.  About 5 percent of respondents reported the general category, “American.”

 Most persons reported only one ancestry group; however, a substantial segment reported a mixed background. Nationally, about 60 percent of the population reported only one ancestry; another 30 percent also wrote in a second ancestry. About 10 percent did not report any ancestry." US Census Bureau [Note: Data on ancestry are based on a sample and are subject to sampling variability.]

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