Perhaps even more surprisingly, the private school share of total enrollments has decreased over the past 15 years, from about 12 percent to 10 percent. This trend seems unlikely to reverse. The U.S. Department of Education projects that in 2021, private schools will enroll about 9 percent of preK-12 students, while public schools will enroll 91 percent.
The attention given to private school issues in policy debates and news stories may leave the impression that private schools play a greater role in American education than they do. Within the last few decades, several states have enacted programs to provide tax credits or publicly funded tuition vouchers to parents who enroll their children in private schools. Some states are currently seeking to expand their voucher programs, although states like Florida and Louisiana have come up against legal problems in doing so. In 2011, Indiana enacted one of the nation's broadest voucher programs which has recently been declared as constitutional by the state supreme court.
It's noteworthy that these highly publicized policies to provide public support for private schools have not led to major increases in the proportions of students enrolling in private schools, according to the national data cited above.
Enrollment trends differ for various types of private schools. As the graph below illustrates, enrollments in Catholic schools have declined since 1995, as have enrollments in schools affiliated with a particular religion. Despite increased enrollments in conservative Christian schools from the late 1990s through 2005, this sector now enrolls fewer students than in 2005, On the other hand, there has been an increase in the number of students enrolled in "unaffiliated" schools, which have a general religious orientation but are not attached to a particular denomination.
Even with declining enrollments, Catholic schools are by far the largest private school sector. In 2010, half of the nation's private elementary school students and three-fourths of its private secondary school students attended Catholic schools. Nonsectarian schools account for the next largest share, comprising one-fifth of private school enrollments at the elementary level, about one-eighth at the secondary level, and one-third among combined elementary-secondary schools.
