How many educational institutions exist in the United States?

http://nces.ed.gov/FastFacts/display.asp?id=84

During most of the last century, the trend to consolidate small schools brought declines in the total number of public schools in the United States. In 1929–30, there were approximately 248,000 public schools, compared with about 99,000 in 2008–09. But this number has increased over the past 10 years: between 1998–99 and 2008–09, there was an increase of approximately 7,800 schools. Since the early 1970s, public school systems have been shifting away from junior high schools (schools consisting of either grades 7 and 8 or grades 7 to 9) and toward middle schools (a subset of elementary schools beginning with grade 4, 5, or 6 and ending with grade 6, 7, or 8). Although the number of all elementary schools (schools beginning with grade 6 or below and having no grade higher than 8) was 1 percent lower in 1998–99 than in 1970–71 (63,500 vs. 64,000), the number of middle schools was 439 percent higher in 1998–99 than in 1970–71 (11,200 vs. 2,100). During the same period, the number of junior high schools declined by 53 percent (from 7,800 in 1970–71 to 3,600 in 1998–99). Between 1998–99 and 2008–09, the number of all elementary schools rose by 6 percent to 67,100, while the subset of middle schools rose by 17 percent to 13,100. During the same period, the number of junior high schools declined by 16 percent to 3,000.

SOURCE: U.S. Department of Education, National Center for Education Statistics. (2011). Digest of Education Statistics, 2010 (NCES 2011-015), Chapter 2.