IQLeague guys have some kind of online IQ test on their site and they group IQ scores of all visitors by different geographical locations (city, country, etc.)(No, I don't take this seriously.) Link
Here is an interesting part - they also group IQ Scores by referrer website and by client browser and operating system.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.