Here is a link to a new online version of the Census Atlas of the United States

According to the State Data Center in the Indiana State Library, it has been more than eighty years since the last Census Atlas was published. This volume is rich in information about the American population from 1790 to 2000. The Ancestry section, in particular, shows many maps, including the Prevalent Ancestry in the U.S. for the year 2000 (Ch. 9, p.141). The Income and Poverty chapter is also helpful, with detailed maps (to the county level) as these topics relate to education, age, gender, and ethnicity.