Top STEM source cities as a percentage of Total F-1 students, the culture that is South India
1. Vijayawada, India
2. Visakhapatnam, India
3. Chennai, India
4. Hyderabad, India
5. Secunderabad, India
6. Pune, India
7. Teheran, Iran
8. Bangalore, India
9. Kolkata, India
10. Dhaka, Bangladesh
For absolute numbers, Hyderabad is #1.
That is all from the new Brookings report, The Geography of Foreign Students in U.S. Higher Education, by Neil G. Ruiz.