This is Where the Wealthiest Americans Live

Worth: $55.5 billion.
Home: Palo Alto, California.

The youngest wealthiest entrepreneur devotes the majority of his incredible wealth to health, education, and various philanthropies. Besides his home in Palo Alto, Mark Zuckerberg also owns a 9.9-million pied-a-terre nearby Dolores Park in San Francisco.

In 2011, Zuckerberg bought his first 5,000-square-ft home in Palo Alto for $7 million, then he snapped up 4 of the surrounding houses for around $43.8 million to protect his family’s privacy.