Top 10 Richest Counties in the United States 2022 | Richest Counties in the US 

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Richest Counties in the US #10

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Nassau County, New York 

Median household income: $120,036 

Richest Counties in the US #9

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Douglas County, Colorado 

Median household income: $121,393 

Richest Counties in the US #8

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Marin County, California 

Median household income: $121,671 

Richest Counties in the US #7

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Arlington County, Virginia 

Median household income: $122,604 

Richest Counties in the US #6

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Howard County, Maryland 

Median household income: $124,042 

Richest Counties in the US #5

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Fairfax County, Virginia 

Median household income: $127,866 

Richest Counties in the US #4

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San Mateo County, California 

Median household income: $128,091 

Richest Counties in the US #3

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Santa Clara County, California 

Median household income: $130,890 

Richest Counties in the US #2

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Falls Church, Virginia 

Median household income: $146,922 

Richest Counties in the US #1

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Loudoun County, Virginia 

Median household income: $147,111