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The 10 Richest Counties in the U.S.

Nassau County,
New York

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10

Median household income: $120,036

Douglas County,
Colorado

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9

Median household income: $121,393

Marin County, California

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8

Median household income: $121,671

Arlington County, Virginia

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7

Median household income: $122,604

Howard County, Maryland

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6

Median household income: $124,042

Fairfax County,
Virginia

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5

Median household income: $127,866

San Mateo County, California

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4

Median household income: $128,091

Santa Clara County, California

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3

Median household income: $130,890

Falls Church,
Virginia

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2

Median household income: $146,922

Loudoun County,  Virginia

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1

Median household income: $147,111