What would be a good language to learn for a financial advisor in California?
Spanish
Spanish is number 1
Definitely español in California.
There’s a huge number of spanish speakers in Calif, It is probably best to listen to their comments 
Estás en california güey, tienes que aprender español…
I would second, third, fourth, fifth their notion. Spanish would be the most helpful one to learn for a financial career in California.
@crownonmyhead, I’m curious why you asked the question. What other language did you think might be in the running? Did you enter a bar bet to see how many Internet posters you could get to type the word “Spanish?”
Seriously, I would like to know.
http://www.mercurynews.com/health/ci_22715983/californias-top-12-languages-after-english
The last column of the list shows the number of speakers of a given language who do not know English well.
Sheer numbers of speakers may not tell the whole story, though. It can depend on how well served each linguistic market is by your intended profession.