Youngest County in Every State

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Source: DenisTangneyJr / Getty Images

16. Kansas: Riley County
> Median age: 24.9 years (county), 36.3 years (state)
> Pop. under 18: 16.9% (county), 24.7% (state)
> Population: 75,696
> Life expectancy: 81.5 years
> County seat: Manhattan

Source: BOB WESTON / Getty Images

17. Kentucky: Christian County
> Median age: 28.4 years (county), 38.6 years (state)
> Pop. under 18: 27.6% (county), 22.9% (state)
> Population: 72,438
> Life expectancy: 75.6 years
> County seat: Hopkinsville

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18. Louisiana: Lincoln Parish
> Median age: 27.6 years (parish), 36.4 years (state)
> Pop. under 18: 20.2% (parish), 23.9% (state)
> Population: 47,536
> Life expectancy: 77.4 years
> Parish seat: Ruston

Source: sociotechnika / Flickr

19. Maine: Androscoggin County
> Median age: 40.7 years (county), 44.3 years (state)
> Pop. under 18: 21.9% (county), 19.3% (state)
> Population: 107,317
> Life expectancy: 78.3 years
> County seat: Auburn

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20. Maryland: Baltimore
> Median age: 35.0 years (county), 38.5 years (state)
> Pop. under 18: 21.0% (county), 22.5% (state)
> Population: 619,796
> Life expectancy: 72.1 years
> County seat: N/A