There may be many more, and you may have some luck in interesting a local Interventional radiologist in doing the procedure in your immediate area, but lacking that, here are a few that I am aware of:
Albany, New York
very experienced but waiting list until March at this poiint;
San Diego, CA
available by e-mail only
Stanford University is allegedly doing a trial "soon". Don't know details.
Dr. Sclafani in NY is not yet treating but you can get on his waiting list. He is a God.
In Orange County, California, the Pacific Center
There is also a thread on this forum, CCSVI Tratment available in the U.S., but it is already 45+ pages, some kinda old, and a bit much to sort through.
Hope this helps. As the last poster mentioned, a lot of the treaters aren't advertising openly, but someone being treated will probably be willing to PM you.
I am in California. If you decide where you are going, drop me a PM. Also if you find any other Caliofornia prividers beyond what I've listed above, let me know.