Ranchos Palos Verdes is one of the richest neighborhoods in Los Angeles, according to Curbed. Jefferson Graham of USA Today called it Los Angeles County's hidden, rural, coastal gem.Potomac, Maryland, is one of the wealthiest towns in the US with an average household income of $248,189, according to Bloomberg.Hillsborough and San Mateo are among some of the wealthiest areas in Silicon Valley, reported Business Insider's Madeline Stone.A household in San Jose, California, needs to earn $204,347 a year to be considered wealthy.Sunnyvale was ranked as the 17th best place to live in America and 15th best place for young professionals by Niche, reported Sue Wood for Patch.Cambrian Park is a neighborhood in San Jose, and is known for its quality education according to San Jose Real Estate Los Gatos Homes. New Almaden was known for its mercury mines in the 19th century. According to the National Parks Service, it produced more than $70 million in quicksilver. New Almaden is considered to be one of the most valuable mines in California. It is now a historic landmark. Cupertino is home to Apple's headquarters. According to Best Places, the median income in Cupertino is $134,872, with a median home price exceeding $2 million. According to Zillow, the median home price in Fremont is over $1 million. Steve Reddicliffe of The New York Times reported that the area is known for its wineries, sandy beaches, and food. Its second-home market sees luxury homes that typically start at $500,000, according to the Coldwell Banker report.