Atherton, Calif., is America’s richest place for the third year in a row.

Its residents made an average of $450,696 in 2017, a $7,293 increase from the prior year, according to the annual Bloomberg Richest Places index.

Billionaires who have called Atherton home include Google’s Eric Schmidt and Facebook’s Sheryl Sandberg. Both Google and Facebook have headquarters within 10 miles of Atherton, which is nestled inside the nation’s tech hub dubbed “Silicon Valley.” Stanford University is just two miles down the road from the town.

Atherton Mayor Bill Widmer said the tree-lined streets and lot sizes of at least one acre offer the residents privacy.

“We value a semi-rural environment,” said Widmer, who moved to Atherton in 1996. “There are few sidewalks and many places don’t have street lights.”

Scarsdale, N.Y., a wealthy suburb north of Manhattan, moved up to the No. 2 spot on this year’s list as its residents enjoyed a $30,000 increase, on average, in annual household income from the prior year, pushing

Cherry Hills Village, Colo., to the No. 3 spot. Top school districts are one reason why residents choose to live there.

“We moved here as many did because of the outstanding school system,” said Scarsdale Mayor Dan Hochvert, a 40-year resident. “That is one of the primary drivers.”

Accessibility to a city center is also a key characteristic of all three. Just as Atherton is accessible to San Francisco and Scarsdale is a train’s ride away from New York City, Cherry Hills Village is a 15- to 20-minute drive to both downtown Denver and the city’s tech center.

Big wigs living in Cherry Hills Village include Super Bowl-winning quarterback Peyton Manning and Denver Broncos General Manager John Elway.

More than half of the top 100 richest places in America were either in the tri-state area — New York, New Jersey and Connecticut — or California. Still, a number of Midwest and Southwest areas made the cut and a handful even are in the top 20.

The bar to make it among the top 100 places was raised to $209,000 in annual income from $198,000 a year earlier.

Four places made their top 100 debut this year including two in California: Tamalpais-Homestead Valley in Marin County and beach city Del Mar; Jericho in New York’s Long Island and Medina, Minn.

Wealth is further concentrated specifically in six counties: Westchester, Bergen and Fairfield counties outside of Manhattan, Cook county of Chicago, Los Angeles County and Montgomery County in Maryland, bordering Washington, D.C.

Rounding out the top 10 are Los Altos Hills and Hillsborough in California, Short Hills, N.J., Highland Park in Texas, Darien in Connecticut, Bronxville in New York and Glencoe, Ill.

Glencoe, a suburb seven miles north of Northwestern University, climbed five spots to land the last spot in the top 10 for the first time.