According to the Open Doors International Student data portal, 974,926 international students studied at U.S. colleges and universities in 2014-2015. Among these international students, 58% of them are come from China, India, South Korea and Saudi Arabia.
Source: Institute of International Education. (2001). "Leading Places of Origin of International Students, 2013-2014." Open Doors Report on International Educational Exchange. Retrieved from https://www.iie.org/opendoors