While I don't have any exact numbers, only impressions, that the highest US-student populations in Spain are concentrated in Salamanca, Granada, Madrid, and Barcelona (probably in that order).
Saludos, MadridMan
_________________________
Visit BarcelonaMan.com for Barcelona information, Transportation, Lodging, & much MUCH more!
Curious about what could POSSIBLY be inside the brain of MadridMan? Visit
MadridMan's Madrid Blog