7.2 million
Number of teachers in the United States in 2009.
Almost 3 million taught at the elementary and middle school level.
The remainder included those teaching at the postsecondary, secondary, preschool, kindergarten levels, special education and other teachers or instructors.
Source: U.S. Bureau of Labor Statistics as cited in the Statistical Abstract of the United States: 2011, Table 615 http://www.census.gov/compendia/statab/
Thanks for the research—that’s a lot of teachers (and government employees)!