Richest U.S. Counties by Household Income

Can you name the richest counties in the U.S. by average annual income per household?

Source - Stanford Data Commons

Excluding the District of Columbia and any Puerto Rican counties

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Last updated: December 28, 2025

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First submitted	June 26, 2025
Times taken	38
Average score	38.9%
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Average Yearly Household Income	County	State
$178,707	Loudoun	Virginia
$159,674	Santa Clara	California
$156,000	San Mateo	California
$154,734	Falls Church	Virginia
$150,113	Fairfax	Virginia
$146,982	Howard	Maryland
$145,737	Douglas	Colorado
$143,408	Nassau	New York
$143,188	Los Alamos	New Mexico

Average Yearly Household Income	County	State
$142,785	Marin	California
$141,446	San Francisco	California
$140,160	Arlington	Virginia
$139,453	Hunterdon	New Jersey
$138,000	Forsyth	Georgia
$137,058	Summit	Utah
$135,960	Somerset	New Jersey
$134,920	Morris	New Jersey
$133,792	Stafford	Virginia

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2 Comments

Level 44

Dec 27, 2025

Believe it's Colorado not Connecticut.

Level 67

Dec 28, 2025

Thanks for letting me know! Will fix.