Which County Is the Richest in America? A State-by-State Wealth Analysis

A comprehensive analysis of income data from GOBankingRates reveals the richest county in each U.S. state, showcasing the dramatic variations in household earnings across America. The findings, based on official U.S. Census Bureau statistics from 2021, paint a fascinating picture of economic inequality and regional prosperity patterns throughout the nation.

These wealthiest counties display tremendous diversity. Some are major metropolitan centers; others are small rural communities with just a few thousand residents. Several surround pristine waterfront areas, while others sprawl across desert landscapes or mountain terrain. Some aren’t technically counties at all—Louisiana parishes and Alaska’s census areas are included in this analysis. What unites them? Each represents the highest median household income in its respective state.

Understanding the Data: What Makes a County “Richest”?

The research methodology relies on median household income as the primary measure of a county’s wealth. According to the American Community Survey conducted by the U.S. Census Bureau, the nationwide median household income in 2021 was $70,784—a slight decline from the 2020 figure of $71,186. Using this as a baseline, the rankings reveal just how far the most prosperous counties exceed the national average.

The income gap across top counties is striking. The wealthiest county’s median household income more than doubles that of the least wealthy county on the state-level list. Loudoun County in Virginia leads the nation with a median household income of $156,821, while Maricopa County in Arizona, the least wealthy among state leaders, reports $72,944. This nearly $84,000 difference illustrates the vast economic disparities within America’s most affluent regions.

State Rankings: The Wealthiest County in Every State

Western Region

Arizona: Maricopa County - $72,944 Major cities include Phoenix, Mesa, and Chandler. This populous county demonstrates how large metropolitan areas can drive state-level wealth metrics.

Idaho: Teton County - $75,837 Home to Victor and Driggs, this mountain community combines natural beauty with affluence.

Arkansas: Benton County - $76,887 Bentonville, Rogers, and Bella Vista dominate this region, which has emerged as a technology and retail hub.

Oklahoma: Canadian County - $76,973 Oklahoma City (partial), Yukon, and Mustang are the largest population centers in this county.

Nevada: Lander County - $92,543 Battle Mountain (unincorporated) represents this sparsely populated but wealthy region.

Oregon: Washington County - $92,025 Portland, Hillsboro, and Beaverton anchor this prosperous Pacific Northwest county.

Hawaii: Honolulu County - $92,600 As the state’s wealthiest county, Honolulu and East Honolulu represent island prosperity.

Wyoming: Teton County - $94,498 Jackson, famous for ski resorts and mountain living, defines this county’s affluence.

Colorado: Douglas County - $127,443 Aurora (partial), Castle Rock, and Parker represent rapid growth and suburban wealth.

New Mexico: Los Alamos County - $123,677 Los Alamos and White Rock derive prosperity from research and specialized industry.

Great Plains and Midwest

Montana: Fallon County - $83,750 Baker is the primary population center in this sparsely populated county.

South Dakota: Lincoln County - $87,560 Sioux Falls (partial) and Harrisburg serve as economic anchors for this region.

Nebraska: Sarpy County - $88,408 Bellevue and Papillion demonstrate suburban prosperity near Omaha.

North Dakota: Burke County - $97,802 Powers Lake and Bowbells represent this region’s wealth, despite modest population.

Kansas: Johnson County - $96,059 Overland Park and Olathe make this the richest county in Kansas.

Missouri: St. Charles County - $91,792 O’Fallon and St. Charles anchor this region near St. Louis.

Iowa: Dallas County - $93,492 West Des Moines (partial), Urbandale (partial), and Waukee demonstrate suburban growth.

Wisconsin: Waukesha County - $94,310 Milwaukee (partial) and Waukesha show how metropolitan proximity drives wealth.

Minnesota: Scott County - $109,031 Shakopee and Savage represent rapid development in the Twin Cities region.

Illinois: Kendall County - $101,816 Aurora (partial), Joliet (partial), Plainfield (partial), and Oswego showcase suburban sprawl.

Indiana: Hamilton County - $104,858 Carmel, Fishers, and Noblesville demonstrate Indianapolis’s prosperous suburbs.

Ohio: Delaware County - $116,284 Columbus (partial), Dublin (partial), and Delaware reflect Ohio’s wealthiest region.

Southeast

Mississippi: Madison County - $74,688 Jackson (partial), Madison, and Ridgeland benefit from capital-area prosperity.

South Carolina: Beaufort County - $74,199 Hilton Head Island and Bluffton represent coastal wealth and tourism prosperity.

Alabama: Shelby County - $82,592 Birmingham (partial), Hoover (partial), Vestavia Hills (partial), and Alabaster demonstrate suburban affluence.

Louisiana: Ascension Parish - $86,256 Gonzales and Donaldsonville serve as regional centers.

West Virginia: Jefferson County - $86,711 Charles Town and Ranson benefit from proximity to Washington, D.C.

Tennessee: Williamson County - $116,492 Franklin, Spring Hill (partial), and Brentwood showcase Nashville’s wealthy periphery.

Kentucky: Oldham County - $109,815 La Grange represents Louisville’s prosperous outskirts.

Virginia: Loudoun County - $156,821 Leesburg serves as the economic center of America’s richest county by state-level standards. This extraordinary income level reflects the concentration of wealth in Northern Virginia and proximity to Washington, D.C.'s federal workforce.

Georgia: Forsyth County - $120,999 Cumming represents Atlanta’s rapidly developing northern suburbs.

Florida: St. Johns County - $88,794 St. Augustine combines historic charm with contemporary prosperity.

North Carolina: Wake County - $88,471 Raleigh, Durham (partial), and Cary demonstrate the Research Triangle’s economic vitality.

Northeast

Maine: Cumberland County - $80,679 Portland, South Portland, and Scarborough represent coastal New England prosperity.

Vermont: Grand Isle County - $85,154 Alburgh and Grand Isle define this small island county’s character.

New Hampshire: Rockingham County - $101,683 Derry and Portsmouth anchor this coastal region.

Massachusetts: Nantucket County - $116,571 Nantucket represents exclusive island wealth and seasonal affluence.

Connecticut: Fairfield County - $101,194 Bridgeport and Stamford showcase southwestern Connecticut’s prosperity.

Rhode Island: Bristol County - $95,102 Bristol and Barrington demonstrate this region’s coastal wealth.

New York: Nassau County - $126,576 Hempstead and Oyster Bay represent Long Island’s prosperous communities.

New Jersey: Morris County - $123,727 Parsippany-Troy Hills (township) and Mount Olive (township) showcase northern New Jersey wealth.

Pennsylvania: Chester County - $109,969 Tredyffrin (township) and West Goshen (township) demonstrate Philadelphia’s wealthy periphery.

Mid-Atlantic and Texas

Delaware: New Castle County - $78,428 Wilmington and Newark represent Delaware’s economic center.

Maryland: Howard County - $129,549 Columbia (unincorporated) represents suburban Baltimore’s prosperity.

Washington: King County - $106,326 Seattle, Bellevue, and Kent showcase Pacific Northwest technology-driven wealth.

California: Santa Clara County - $140,258 San Jose, Sunnyvale, and Santa Clara represent Silicon Valley’s extraordinary prosperity.

Texas: Rockwall County - $111,595 Dallas (partial), Garland (partial), Rowlett (partial), and Rockwall form one of the nation’s wealthiest regions.

Utah: Summit County - $116,351 Park City represents ski resort wealth and high-altitude affluence.

States with the Most Wealthy Counties

Beyond identifying the richest county in each state, the analysis reveals which states contain multiple counties among America’s top earners. Virginia dominates with 18 of the nation’s 100 richest counties. California follows with 11, Maryland with 10, and New Jersey with 9. New York and Texas each claim 6 of the top 100 wealthiest counties, demonstrating how certain regions concentrate economic opportunity.

This concentration reflects broader economic patterns: proximity to major metropolitan areas, technology hubs, federal employment centers, and coastal access all correlate with higher household incomes. The richest county in each state tells a unique story about regional economic development, demographic patterns, and where prosperity concentrates in twenty-first century America.

Data Source: U.S. Census Bureau’s American Community Survey (2021), with methodology current as of September 6, 2023.