The richest county in America by median household income in 2026 is Loudoun County, Virginia, which has held the top position in most national rankings since 2019.
This guide covers the full top 10, what the rankings measure, and which states produce the most wealthy counties.
1. Top 10 the Richest County in America
Rankings of the richest county in America are based on median household income from American Community Survey five-year estimates, the most comprehensive and reliable source for county-level income data.
Median income reflects the middle point of all household incomes, making it less sensitive to extreme outliers than average income.
What is the top 10 richest counties in America? Let’s check this list.
Loudoun County, Virginia
- Median household income: approximately $157,000.
Loudoun County sits at the western edge of the Washington D.C. metropolitan area. Its wealth is driven by proximity to federal government agencies, defense and technology contractors, and the data center industry.
The county hosts more data center capacity than any other jurisdiction in the world, and the jobs that support that infrastructure pay exceptionally well. Population: approximately 440,000.
Santa Clara County, California
- Median household income: approximately $148,000.
Considered the richest county in America, Santa Clara County is the core of Silicon Valley, home to Apple, Google’s parent Alphabet, Intel, Cisco, and dozens of other major technology companies.
High base salaries, stock compensation, and a concentration of engineering and executive roles produce median incomes that consistently rank near the top nationally. The county’s median home value exceeds $1.5 million.
San Mateo County, California
- Median household income: approximately $143,000.
San Mateo County connects San Francisco to Silicon Valley and benefits from both. It houses major tech employers including Meta and Oracle, and its real estate market reflects that concentration. The county has among the highest property tax bases per capita in California.
Fairfax County, Virginia
Median household income: approximately $137,000.
Fairfax County is the most populous county in Virginia with over 1.1 million residents and remains one of the wealthiest in the country. It hosts major federal agencies, defense contractors, and the headquarters of several Fortune 500 companies including Booz Allen Hamilton and DXC Technology. Its school system is one of the best-funded in the United States.
Howard County, Maryland
- Median household income: approximately $128,000.
The next county to be considered the top richest county in America is Howard County.
Howard County sits between Baltimore and Washington D.C. and draws professionals from both cities’ employment centers. Its Columbia planned community, developed from 1967, was designed as a racially integrated middle-class suburb and has grown into one of the most affluent mid-size communities in the country.
Teton County, Wyoming
- Median household income: approximately $126,000.
Teton County is an outlier on this list. Its high income figures reflect the concentration of ultra-high-net-worth individuals who own property in or around Jackson Hole, one of the most exclusive resort communities in the United States. The county’s average income and wealth per resident are far higher than the median suggests, because a large population of seasonal workers and service employees pulls the median down from what full-time wealthy residents represent.
Marin County, California
- Median household income: approximately $124,000.
Marin County is located just north of San Francisco across the Golden Gate Bridge. Its small permanent population of about 260,000 lives in some of the most expensive real estate in California.
The county has limited commercial and industrial development, which preserves its residential character and constrains population growth while maintaining high income levels.
Arlington County, Virginia
- Median household income: approximately $122,000.
Arlington County is the smallest county by land area in the United States, covering just 26 square miles, but it is one of the most economically dense.
The Pentagon, Amazon’s HQ2, and a high concentration of federal government workers and contractors make it one of the wealthiest jurisdictions in the country relative to its size.
Douglas County, Colorado
- Median household income: approximately $118,000.
Douglas County lies between Denver and Colorado Springs and has been one of the fastest-growing counties in the United States since the 1990s.
Its wealth is driven by a high concentration of technology, finance, and healthcare professionals who commute to Denver while living in suburban communities in the county.
Forsyth County, Georgia
- Median household income: approximately $116,000.
Forsyth County, north of Atlanta, has transformed from a rural county into one of the wealthiest suburban communities in the southeastern United States over the past two decades.
Growth has been driven by Atlanta’s expanding technology and financial services sectors, with residents choosing Forsyth for its lower property taxes and newer housing stock.
2. What Makes a County Rich? How the Rankings Work
Income rankings of the richest county in America measure household income, not individual wealth, which shapes which counties appear at the top and why.
Two methodological distinctions affect how these rankings for the richest county in america should be interpreted.
Median Household Income vs. Average Household Income
Median household income is the standard metric for county wealth rankings because it represents the middle of the distribution. Half of households earn more, half earn less.
Average income is more easily distorted by a small number of extremely high earners, which is why counties like Teton County, Wyoming rank lower on median income than on average income.
Home Values and Investment Income as Wealth Indicators
Household income alone understates wealth in counties with high property values.
In Santa Clara and Marin counties, the primary source of household net worth for many residents is not income but home equity accumulated over decades of real estate appreciation.
A household earning $100,000 in Marin with a home purchased 20 years ago may have net worth exceeding $2 million.
3. Which States Have the Most Wealthy Counties?
The richest county in America reveal a clear geographic concentration. Three states account for eight of the ten positions.
Virginia and the Washington D.C. Metro Area
Virginia holds three of the top 10 positions of the richest county in America. The D.C. metropolitan area as a whole represents the largest concentration of wealthy counties in any single metro area in the country.
Federal spending, defense contracting, intelligence community employment, and technology consulting create a high-wage professional economy that spans multiple jurisdictions.
California’s Bay Area Counties
California holds three top 10 positions (Santa Clara, San Mateo, Marin) and several additional Bay Area counties rank in the top 20 nationally, including Contra Costa and San Francisco.
The technology industry’s concentration in the Bay Area and the equity compensation common in the sector drive median household incomes that no other regional economy in the country matches at scale.
Other States With Multiple Wealthy Counties
Colorado (Douglas) and Georgia (Forsyth) each have one representative in the top 10, and both reflect the same pattern: rapidly growing suburban counties adjacent to major metropolitan areas with diversified, high-skill economies.
Connecticut has several counties that rank in the top 20 nationally, particularly Fairfield County, which houses the headquarters of major financial firms and their highly compensated employees.
Read more: Most Affordable Cities in California: Places That Offer More for Less
4. FAQs
Is Loudoun County the Richest County in Every Ranking?
No. The top-ranked county depends on the data source and metric used. Loudoun County holds the top position in most median household income rankings from the U.S.
Which Is the Poorest County in America?
Poverty rankings change slightly year to year, but counties in the Mississippi Delta, Puerto Rico, and parts of Appalachia consistently hold the lowest median income positions.
What County Has the Most Millionaires?
Los Angeles County has the highest absolute number of millionaires of any county in the United States due to its large population. When measured by concentration of millionaires as a percentage of residents, smaller counties with exclusive communities rank higher. T
Conclusion
The richest county in America in 2026 is Loudoun County, Virginia, anchored by the federal government contracting economy and the data center industry that has made the D.C. suburb one of the highest-income jurisdictions in the country for over a decade.
