List of U.S. cities with high transit ridership [View all]
per wikipedia:
1. New York, New York - 54.24%
2. Jersey City, New Jersey - 46.62%
3. Washington, D.C. - 38.97%
4. Boston, Massachusetts - 31.6%
5. San Francisco, California - 30.29%
6. Philadelphia, Pennsylvania - 26.43%
7. Arlington, Virginia - 26.28%
8. Yonkers, New York - 25.47%
9. Chicago, Illinois - 25.38%
10. Newark, New Jersey - 24.04%
11. Pittsburgh, Pennsylvania - 21.14%
12. Alexandria, Virginia - 20.55%
13. Baltimore, Maryland - 19.55%
14. Seattle, Washington - 17.79%
15. Berkeley, California - 17.36%
16. Daly City, California - 17.27%
17. Oakland, California - 16.72%
18. Buffalo, New York - 15.62%
19. Richmond, California - 15.55%
20. Hartford, Connecticut - 15.5%
21. Atlanta, Georgia - 14.85%
22. Edison, New Jersey - 14.82%
23. Paterson, New Jersey - 13.85%
24. East Los Angeles, California - 13.75%
25. Minneapolis, Minnesota - 13.19%
26. Portland, Oregon - 12.64%
27. Cleveland, Ohio - 12.22%
28. Miami, Florida - 12.16%
29. Stamford, Connecticut - 11.86%
30. San Juan, Puerto Rico - 11.26%
The complete list is at: http://en.wikipedia.org/wiki/List_of_U.S._cities_with_high_transit_ridership