"Region" would have to be extremely small around here to not include someone who speaks almost any (natural) language a typical person could think of.
I'll just go ahead and answer a different question: If I could instantly learn any language and my SO could instantly learn it also, I'd pick ASL, because it would be very nice to have a way to communicate that works where talking either doesn't work (loud places, for example) or would disturb others, or just across a large room.

I was thinking Hammond - old and rich (at least beforehand)