Source: Jessica Davis and Kurt J. Bauman, U.S. Census Bureau, P20-559, August 2008
From the press release:
Enrollment in two- and four-year colleges and universities in the U.S. reached 20.5 million in 2006, up 3 million since 2000. This included 17.1 million undergraduates and 3.4 million students in graduate or professional schools.
These statistics are from the U.S. Census Bureau’s School Enrollment in the United States: 2006, a report that describes the characteristics of the nation’s 79 million students in 2006.
This is the first school enrollment report from the Census Bureau to use data from both the Current Population Survey (on which previous reports have been based) and the American Community Survey. Incorporating these data result in new state-by-state comparisons of enrollment characteristics while preserving the historical comparisons of school enrollment.
In 2006, there were more students in college and high school, but fewer in nursery school, kindergarten and elementary school, than in 2000. This change reflects the composition of school enrollment by age in the United States for that time period.
– Detailed tables