What does it take to be one of America's most expensive housing markets? In 2026, the top 10 counties all have median home values exceeding $1 million. Here's how the ranking shapes up, based on the latest ACS 5-Year Estimates.
The Top 10 Counties
Based on median home values from the 2020-2024 American Community Survey, these are the most expensive counties in the United States:
| # | County | State | Median Home Value |
|---|---|---|---|
| 1 | Teton County | Wyoming | $1,633,900 |
| 2 | Nantucket County | Massachusetts | $1,593,800 |
| 3 | San Mateo County | California | $1,559,600 |
| 4 | Marin County | California | $1,507,300 |
| 5 | Santa Clara County | California | $1,490,600 |
| 6 | San Francisco County | California | $1,394,500 |
| 7 | Dukes County | Massachusetts | $1,165,800 |
| 8 | Pitkin County | Colorado | $1,139,100 |
| 9 | New York County | New York | $1,090,500 |
| 10 | Alameda County | California | $1,090,100 |
Patterns in the Data
Several distinct patterns emerge:
1. Resort and Second-Home Markets
Teton (Wyoming), Nantucket (Massachusetts), Dukes (Massachusetts), and Pitkin (Colorado) share a common trait: they are luxury resort destinations. These counties see extreme demand from high-net-worth buyers seeking seasonal homes. Local wages are often far below what's needed to buy, creating a market dominated by outside capital.
2. Tech-Driven Coastal Markets
San Mateo, Santa Clara, Marin, San Francisco, and Alameda counties are all in the San Francisco Bay Area, home to Silicon Valley. The concentration of tech wealth drives housing prices to extremes. Median household incomes in San Mateo and Santa Clara exceed $150,000—but even that isn't enough to comfortably buy at these price points.
3. NYC and Boston Metro
New York County (Manhattan) and Nantucket represent the Northeast's high-cost hubs. Manhattan's density and international demand make it unique; Nantucket's island geography limits supply.
What These Markets Have in Common
- Limited supply: Islands (Nantucket, Dukes, Manhattan), mountains (Teton, Pitkin), or coastal geography constrain new construction
- External demand: Prices are driven by buyers who don't depend on local wages
- High price-to-rent ratios: Typically 40-70+, meaning renting is far cheaper than buying
- Low owner occupancy relative to price: Many homes are second homes or investment properties
What It Takes to Buy in These Markets
At a $1.5 million price point with 20% down ($300,000), a 30-year mortgage at 7.4% runs about $8,300/month for principal and interest alone. Add property taxes (1-2%) and insurance, and total monthly costs often exceed $12,000.
This reality has several implications:
- Entry requires significant wealth: Even dual high-income earners struggle in these markets
- Renting is often the rational choice: Price-to-rent ratios above 40 rarely favor buying
- Migration flows outward: Many long-term residents eventually leave for more affordable regions
Are These Markets Good Investments?
High prices don't automatically mean high future returns. Consider:
- Concentration risk: A single industry (tech) or buyer type (foreign investors) can dominate the market
- Liquidity: Premium markets can slow dramatically in downturns
- Carrying costs: Property taxes, insurance, and maintenance scale with price
- Alternative markets: Inland counties with similar income profiles often offer better returns
For long-term owners who can absorb volatility, premium markets can preserve wealth. For investors seeking appreciation, secondary markets typically offer better risk-adjusted returns.
How the Ranking Shifts
The top 10 rarely changes dramatically year over year, but the composition varies:
- California counties rise and fall with tech sector cycles
- Mountain resort counties have grown steadily since 2020 as remote work expanded
- Coastal New England remains stable due to supply constraints
Watch the full 100-county ranking for emerging entrants.
The Bottom Line
America's most expensive counties share geography, demographics, and economics that make prices unlikely to fall meaningfully. They are the playgrounds of global wealth, constrained by nature and regulation. For buyers, they demand extraordinary resources. For observers, they reveal how extreme income inequality and housing scarcity interact in the most desirable places on Earth.