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There are 3,144 counties and county-equivalents in the United States. The source of the data is the U.S. Census Bureau and the data is current as of the indicated year. Independent cities are considered county-equivalent by the Census Bureau.
Before the American Civil War, the wealthiest counties were primarily located in Louisiana and Mississippi, because of the high number of enslaved people, who were not included in the population.[1]
Loudoun County, Virginia, a suburb of Washington, D.C., is the highest-income county by median household income. Another Washington, D.C. suburb, Arlington County, Virginia, ranked as the highest-income county by median family income as of 2013.[2]
The chart below depicts the 100 highest income counties in the United States by median household income according to the 2020 United States census.[3] Virginia has the most counties in the top 100 with 18. It is followed by California with 11; Maryland with 10; New Jersey with nine; New York and Texas with six each; Illinois with five; Colorado, Massachusetts, and Minnesota with four each; Ohio and Pennsylvania with three each; Georgia, Indiana, Utah, and Washington with two each; and Connecticut, Washington, D.C., Iowa, Kansas, Kentucky, New Hampshire, New Mexico, Tennessee, and Wisconsin with one each.
For more detailed lists of rankings of counties and places in the individual states, see the following pages:
