The Counties Where Homes Cost The Most

In Teton County, Wyoming, the median owner-occupied home is valued at $1,633,900, nearly five times the U.S. median of $332,700. It's the priciest county to own a home in the United States, but there are many similarly costly examples. The top eight include two Rocky Mountain resort counties, two Massachusetts island counties, and four counties around San Francisco Bay. Somehow, America's mega-city didn't even crack the list. The ranking comes from the U.S. Census Bureau's 2020-2024 American Community Survey five-year estimates, released in January 2026.

Teton County, Wyoming

The American county where homes cost the most isn't home to a big city; it's in rural northwestern Wyoming, along the border with Idaho and close to Montana. Teton County, which takes its name from the Grand Teton mountain range that runs through the region, may appear to be full of open land. However, 97% of it is state- or federally-owned public lands, meaning the amount of developable area is relatively tiny. The remote and scenic setting is a major draw to wealthy people, often looking for a second or vacation home convenient to Jackson Hole's ski slopes or Grand Teton National Park, which helps push Teton County into first place in the entire country in per-capita income. This concentration of wealth helps push home values in this high-demand vacation spot to $1,633,900, the highest in the country. The problem has compounded in recent years, as demand has increased but construction remains below levels needed to keep up with job growth.

Nantucket County, Massachusetts

Not far behind with a $1,593,800 median home value, Nantucket is similarly limited landwise, but for far different reasons. Sitting off the coast of Massachusetts, this island county is another of America's best-known vacation destinations for the wealthy, many of whom purchase second homes there. Meanwhile, nearly 1 in 4 properties in Nantucket County is used as a short-term rental, making real estate as much a cash-generating investment as it is a place to call home. The problem is made even more acute by substantial amounts of open space on the island set aside as preserved or protected land.

San Mateo County, California

Third-place San Mateo County brings the list to the Bay Area. Its median owner-occupied home value is $1,559,600, while median household income stands at $158,855, almost twice the nationwide figure of $80,734. The county stretches across the San Francisco Peninsula from dense communities bordering the bay to coastal settlements along the Pacific. One particularly striking housing constraint applies to the unincorporated urban Midcoast. San Mateo County's Local Coastal Program normally limits that area to 40 new housing-unit building permits per year. After 102 units were permitted in 2025, including affordable housing allowed above the normal cap, the county said only 18 additional permits could be issued across 2026 and 2027 unless the rule is amended.

Marin County, California

On the opposite side of San Francisco from San Mateo County, Marin County serves as a contrasting but almost as expensive place to call home. The median home value sits at $1,507,300, the final county on our list above the $1.5 million mark. Despite its proximity to the city, over 80% of Marin County homes are single-family detached properties, while relatively restrictive land-use policies limit potential development spots. New housing construction has also remained relatively limited, making it difficult for supply to catch up with demand.

Santa Clara County, California

At the heart of Silicon Valley, Santa Clara County has some of the strongest homebuying power in the country, helping push its median home value to $1,490,600. The county's median household income is more than $160,000, reflecting the extraordinary wealth generated by one of America's highest-profile regional economies. That wealth and demand have run into a long-running housing shortage, with local officials repeatedly pointing to low supply as a key part of the area's affordability crisis. With more high-income households competing for a limited stock of homes, Santa Clara County has become expensive even by Bay Area standards, falling only about $17,000 short of Marin County directly above it.

San Francisco County, California

The heart of the ultra-pricey Bay Area comes in sixth place in the list of American counties where homes cost the most, with a median home value of $1,394,500. It's much the same story as the rest of the region, characterized by high incomes and strong demand mixed with low housing construction and many relatively low-density areas for a city of its size. Land and construction costs are high, with builders and contractors often facing extensive red tape and long approval times to build homes. Unlike many other cities on this list, just 38.2% of homes are owner-occupied, with most housing units rented instead. Altogether, high-income demand and the difficulty and expense of adding new housing have kept San Francisco real estate among the most expensive in the country.

Dukes County, Massachusetts

Dukes County, which contains Martha's Vineyard and the Elizabeth Islands, has a median owner-occupied home value of $1,165,800. As on Nantucket, seasonal demand changes the housing equation considerably. A 2024 Martha's Vineyard Commission analysis found that only 39% of the island's homes were occupied year-round. It also counted 3,999 registered short-term rentals in April 2024, compared with just 1,614 year-round rental units. Building is expensive as well: Massachusetts reported an average permitted construction value of roughly $780,000 per housing unit on Martha's Vineyard in 2023, second only to Nantucket among regions in the state.

Pitkin County, Colorado

Pitkin County rounds out the top eight at $1,139,100. Its best-known community is Aspen, placing another luxury mountain destination alongside Teton County near the top of the national ranking. Housing costs have pushed much of Aspen's workforce farther down the Roaring Fork Valley. The City of Aspen notes that many employees commute from neighboring communities such as Basalt, Carbondale, and Glenwood Springs, while Pitkin County warns prospective employees that housing remains expensive even outside Aspen and that a Carbondale-to-Aspen commute can stretch well beyond an hour in winter conditions. The geography of the valley makes the divide between high-value resort housing and workforce housing particularly visible.

Islands, Mountains, And The Bay Area Dominate

The geography of the top eight is more revealing than the dollar amounts alone. Four are in the San Francisco Bay Area, where high incomes collide with expensive land and constrained housing production. The other four are resort markets in Wyoming, Colorado, Nantucket, and Martha's Vineyard, where mountain terrain, islands, limited developable land, and seasonal demand restrict the housing available to year-round residents. Perhaps the most surprising omission is Manhattan. New York County's median owner-occupied home value of $1,090,500 puts it ninth, immediately behind Pitkin County. By the Census Bureau's measure, America's most expensive county-level housing markets are therefore dominated not by Manhattan, but by the Bay Area, Rocky Mountain resort country, and two small islands off Massachusetts.