42. Tiburon, California (Average Household Income: $270,969)

Tiburon is just across the Golden Gate Bridge from San Francisco, located on the Tiburon Peninsula. Tiburon is now a commuter and tourist town, linked by ferry services to San Francisco and Angel Island.

It’s very difficult to develop properties in Tiburon. While there is open space, the biodiversity and presence of rare and endangered species are often used as reasons to prevent further building projects.