Youngest County in Every State

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Source: afiler / Flickr

26. Montana: Big Horn County
> Median age: 29.9 years (county), 39.8 years (state)
> Pop. under 18: 33.6% (county), 22% (state)
> Population: 13,290
> Life expectancy: 73.6 years
> County seat: Hardin

Source: Public Domain / Wikimedia Commons

27. Nebraska: Thurston County
> Median age: 28.1 years (county), 36.3 years (state)
> Pop. under 18: 35.6% (county), 24.8% (state)
> Population: 7,055
> Life expectancy: 73.9 years
> County seat: Pender

Source: jmoor17 / Getty Images

28. Nevada: Elko County
> Median age: 34.1 years (county), 37.7 years (state)
> Pop. under 18: 27.7% (county), 23.2% (state)
> Population: 52,377
> Life expectancy: 78.3 years
> County seat: Elko

Source: mountinez / Getty Images

29. New Hampshire: Strafford County
> Median age: 37.0 years (county), 42.7 years (state)
> Pop. under 18: 19.3% (county), 19.8% (state)
> Population: 126,552
> Life expectancy: 79.5 years
> County seat: Dover

Source: SeanPavonePhoto / Getty Images

30. New Jersey: Hudson County
> Median age: 34.9 years (county), 39.6 years (state)
> Pop. under 18: 20.4% (county), 22.3% (state)
> Population: 679,756
> Life expectancy: 80.3 years
> County seat: Jersey City