America is a nation of suburbs. Half of people in the U.S. live in a suburban county, according to data from the Pew Research Center. Suburbs – the smaller cities and towns that ring larger metro areas – are growing faster than cities or rural areas. Roughly 175 million Americans now live in the suburbs or small cities, a 16% increase from 2000.

Today’s suburbs aren’t quite the like Levittowns of the 1950s, though. They’re more racially diverse, for one. And they’re also more economically diverse than you might realize. Poverty – once seen as a primarily urban or rural problem – has spread to the bedroom communities of big cities. Today, half of poor people in the U.S. live in the suburbs, Pew found. At the same time, home values and average salaries in elite suburbs place many of their residents squarely in the top 5% of income earners.

The richest suburbs in America

There’s a growing divide between the richest suburbs and the rest of America. While the average earnings per worker in the suburbs were $46,081, those in the wealthiest enclaves are earning far more.

When Zippia looked at Census data for nearly 3,000 suburbs (defined in their analysis as cities with more than 2,000 people located within 30 miles of the 100 biggest cities in the U.S.), the numbers were striking. The richest towns had a median household income of close $200,000 (or more), while median home values topped $1.5 million. And each suburb was located in one of just two states: New York and California.

The 10 wealthiest suburbs in America are:

10. Old Brookeville, New York

• Median income: $202,083
• Median home value: $1.75 million

This town on Long Island is home to 2,134 people. The median household income is $202,083.

9. Ross, California

• Median income: $199,107
• Median home value: $2 million+

Ross, a town of about 2,400 north of San Francisco, is the only suburb on this top 10 list that has a median income below $200,000.

8. Monte Sereno, California

• Median income: $202,321
• Median home value: $2 million+

The wealthy San Jose suburb of Monte Sereno is located in the heart of Silicon Valley. The town has a population of about 3,300, and 91% of residents are owners, not renters.

7. Brookville, New York

• Median income: $237,083
• Median home value: $1.84 million

Right next door to Old Brookville is Brookville, where the median household income is more than $237,000, and the typical house is valued at $1.84 million.

6. Hillsborough, California

• Median income: $216,292
• Median home value: $2 million+

This Bay Area town is located about 17 miles south of San Francisco. It’s one of the larger cities on this list, with a population of 10,825. The median income is $216,292, with over 80% of households earning more than $100,000 a year.

5. Woodside, California

• Median income: $223,934
• Median home value: $2 million+

Just down the highway from Hillsborough is Woodside. Nearly three-quarters of households in this town of 5,287 earn $100,000 a year or more. Ninety-four percent of homes are valued at $1 million or more.

4. Sands Point, New York

• Median income: $231,667
• Median home value: $2 million+

About 2,600 people live in this town on the northern shore of Long Island. Ninety percent of homes are valued at $1 million or more, and 61% of households bring in $200,000 or more per year. This Gatsby-esque estate situated on the shores of Long Island Sound is on the market for $13.9 million.

3. Portola Valley, California

• Median income: $232,981
• Median home value: $2 million+

Another northern California suburbs lands in the No. 3 spot on this list. Portola Valley is not far from the tech hubs of Palo Alto and Mountain View. Roughly 53% of households make more than $200,000 a year.

2. Los Altos Hills, California

• Median income: $243,701
• Median home value: $2 million+

Los Altos Hills continues the trend of wealthy San Jose suburbs. Seventy-seven percent of households earn more than $100,000 a year, and 95% of homes are valued at $1 million or more. This 5-bedroom estate is currently on the market for $49.9 million.

1. Atherton, California

• Median income: $250,000
• Median home value: $2 million+

Atherton is the richest suburb in America. It’s located – you guessed it – in Silicon Valley, just north of Palo Alto, and has a population of roughly 7,000. Sixty percent of households make more than $200,000 a year, and 91% of homes are worth $1 million and up. Among Atherton’s wealthy residents? Google’s Eric Schmidt, Microsoft co-founder Paul Allen, and investor Charles Schwab.

Other wealthy suburbs

While the suburbs of New York, San Francisco, and San Jose top the list of America’s richest towns, they’re not the only places where the well-off live. Zippia’s list of the 100 wealthiest suburbs also includes communities outside of Los Angeles (Palos Verdes Estates), Nashville (Belle Meade), Seattle (Medina), Dallas (Highland Park), and Chicago (Kenilworth). You can see the full list of the 100 richest suburbs in America here.