* Only four-year institutions: This would yield a relatively small number.
* Two-year colleges (community colleges): This would increase the number.
* Specialized schools and institutions: Including art schools, theological seminaries, and other specialized post-secondary institutions would significantly increase the count.
To get a precise number, you would need to specify your criteria and consult a comprehensive database of educational institutions. A quick search will reveal several prominent universities and colleges, but a complete count requires more detailed research.