8. Mountain View, Calif.
The birthplace of the silicon semiconductor, Mountain View is a hub for technology firms in the Silicon Valley area. The city has a median household income of $157,243, while just over 70% of the residents have a household income higher than $100,000, according to census data. A primary reason for the amount of wealth in this community is that most residents work at one of the nearby tech companies. According to the city's annual comprehensive financial report, Google hires the most, followed by El Camino Hospital. Intuit and Microsoft are also big employers in the area.