The best way, that I know of, to identify the demographics is to use the Google Analytics along with Google Adwords. Spending a certain amount of money, on certain areas using geotagging, you can use all that data on Google Analytics and get a good impression of the demographics. The only thing you have to find out for yourself is what amount of data you need in that region and for that particular field that you are targeting.
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RE: Demographic Data For Keywords