The Richest County in Each State

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16. Johnson County, Kansas
> County median household income: $74,717
> State median household income: $51,332
> Pct. households in county making $200,000 or more: 8.2%
> 2013 county unemployment rate: 4.7%

Many residents of Johnson County commute to nearby Kansas City, where the concentration of businesses likely offers more employment opportunities and higher wages. The annual median household income in Johnson was nearly $75,000 over the five years through 2013, and less than 5% of the county’s workforce was unemployed in 2013, one of the lower unemployment rates nationwide.

17. Oldham County, Kentucky
> County median household income: $83,391
> State median household income: $43,036
> Pct. households in county making $200,000 or more: 10.4%
> 2013 county unemployment rate: 6.5%

Kentucky had an annual median household income of $43,036 over the five years through 2013, one of the lowest incomes compared to other states. Households in Oldham County, the state’s richest county, earned far more than that, with an annual median income of $83,391 over that period. In addition, more than one in 10 county households earned at least $200,000 a year, one of the highest rates even among other wealthiest counties. The median income among Oldham households was also roughly four times higher than the comparable figure in McCreary, Kentucky’s poorest county — one of the largest income gaps reviewed.

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18. Ascension Parish, Louisiana
> County median household income: $69,070
> State median household income: $44,874
> Pct. households in county making $200,000 or more: 3.5%
> 2013 county unemployment rate: 5.3%

While Ascension Parish was the wealthiest area in Louisiana, with an annual median household income of nearly $70,000 over the five years through 2013, residents fared worse than most Americans in other measures. For example, less than 25% of residents had at least a bachelor’s degree over that period, versus the comparable national rate of nearly 29%. Ascension’s poverty rate of 12.3% did not exceed the national figure, but it was still considerably worse than in most of the other states’ wealthiest counties.

19. Cumberland County, Maine
> County median household income: $57,461
> State median household income: $48,453
> Pct. households in county making $200,000 or more: 5.1%
> 2013 county unemployment rate: 5.3%

While Cumberland households were the wealthiest in Maine, the annual median income of $57,461 over the five years through 2013 was not especially high compared to the nation. Perhaps as a result, however, income was relatively well distributed in the state. Cumberland households earned less than $21,000 more than the five-year median income in Piscataquis County, the state’s poorest area — nearly the smallest such income gap nationwide.

20. Howard County, Maryland
> County median household income: $109,865
> State median household income: $73,538
> Pct. households in county making $200,000 or more: 18.1%
> 2013 county unemployment rate: 4.9%

Maryland had an annual median income of $73,538 over the five years through 2013, the highest of any state and higher even than the income in many of the richest counties in other states. In Howard County, located just outside Baltimore, residents were exceptionally wealthy. A typical household earned nearly $110,000 annually over that period, $71,418 higher than in the state’s poorest county. Howard residents were also very well educated — 60% had at least a bachelor’s degree, more than twice the comparable national figure.