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Richest U.S. Counties by Household Income

Can you name the richest counties in the U.S. by average annual income per household?
Excluding the District of Columbia and any Puerto Rican counties
Quiz by
MeowILoveCats123
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Last updated: December 28, 2025
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First submittedJune 26, 2025
Times taken41
Average score38.9%
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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
+1
Level 45
Dec 27, 2025
Believe it's Colorado not Connecticut.
+1
Level 67
Dec 28, 2025
Thanks for letting me know! Will fix.