They can be found in NYC, New Jersey, Atlanta, Houston, Dallas, Chicago, Silicon Valley, UK and many many other places. Because of the Hindu diaspora in these places, RSS has been quite successful in recruiting extremist adherents for their cause.
However I believe this phenomenon - in spite of RSS hopes, is temporary. The kids will become Americanized and will integrate to the American mainstream.
Sitting in the US, no native-born US kid gives a flying eff about what is happening in Bangladesh, India or Pakistan. Just not in their radar...