10. Osaka, Japan
Osaka’s superrich population: 2,730, up 11.7 percent.
A hub of marine transportation, Osaka has been an economic and cultural center of Japan since ancient times. Now a startup hotspot, the city and prefecture has given birth to brands such as Panasonic, Sharp, Suntory and Nissin Food Products, as well as more recently founded high-tech firms including Sakura Internet and Capcom, says Forbes magazine.