26. Jefferson County, Montana
> County median household income: $60,863
> State median household income: $46,230
> Pct. households in county making $200,000 or more: 4.0%
> 2013 county unemployment rate: 5.1%

Jefferson County’s annual median household income of $60,863 was not especially high compared to the nation as a whole. Nonetheless, its residents were relatively well off. It was very common to own a home in the area, with nearly 86% of housing units occupied by their owners over the five years through 2013. The comparable national figure, by contrast, was less than 65%. In addition, just 7.8% of county residents lived in poverty over that period, roughly half the comparable national figure of 15.4%.

27. Sarpy County, Nebraska
> County median household income: $69,965
> State median household income: $51,672
> Pct. households in county making $200,000 or more: 3.5%
> 2013 county unemployment rate: 4.0%

A strong job market may have contributed to high incomes in Sarpy County, Nebraska’s wealthiest area. The county’s unemployment rate was just 4% in 2013, one of the lowest nationwide. As in most of the states’ richest counties, residents were also relatively well educated. More than 36% of adults had at least a bachelor’s degree over the five years through 2013, considerably higher than the comparable national figure of nearly 29%.

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28. Elko County, Nevada
> County median household income: $70,238
> State median household income: $52,800
> Pct. households in county making $200,000 or more: 4.0%
> 2013 county unemployment rate: 5.9%

With an annual median income of more than $70,000 over the five years through 2013, Elko County households were relatively wealthy by every standard we considered. While higher incomes are often associated with better educational attainment rates, this was not the case in Elko County. Some 83.2% of adults had completed at least high school, and 16.4% of adults had a bachelor’s degree or more over the five years through 2013. Among states’ wealthiest counties, both rates were among only a handful to not exceed the comparable national rates. Elko County residents were also less likely than most Americans to have health insurance.

29. Rockingham County, New Hampshire
> County median household income: $77,348
> State median household income: $64,916
> Pct. households in county making $200,000 or more: 7.4%
> 2013 county unemployment rate: 5.7%

New Hampshire households tend to be wealthier than most in the nation. Rockingham County households had an annual median income of $77,348 over the five years through 2013, $12,432 higher than the comparable state figure. This was one of the smaller gaps reviewed. As in many wealthy areas, Rockingham also had a relatively low unemployment rate of just 5.7%. In addition, while 15.4% of Americans lived in poverty over that period, just 5.5% of Rockingham residents did, one of the lowest rates in the nation.

30. Hunterdon County, New Jersey
> County median household income: $106,143
> State median household income: $71,629
> Pct. households in county making $200,000 or more: 18.5%
> 2013 county unemployment rate: 5.9%

A typical household in New Jersey earned more than typical households in every state except for Maryland. Hunterdon County was not only the state’s wealthiest, but also one of the wealthiest in the nation, with a median annual household income of $106,143 during the five years through 2013, more than double the comparable national figure. Many residents likely took advantage of the higher incomes and job opportunities in New York City, which was within commuting distance to much of the area. However, the county still reported a slight population decrease between the middles of 2012 and 2013, one of only a few counties reviewed where the population declined.