Youngest County in Every State

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Source: Thinkstock

11. Hawaii: Honolulu County
> Median age: 37.6 years (county), 38.8 years (state)
> Pop. under 18: 21.4% (county), 21.6% (state)
> Population: 990,060
> Life expectancy: 81.4 years
> County seat: Honolulu

Source: kenlund / Flickr

12. Idaho: Madison County
> Median age: 23.5 years (county), 35.9 years (state)
> Pop. under 18: 27.1% (county), 26.2% (state)
> Population: 38,241
> Life expectancy: 81.1 years
> County seat: Rexburg

Source: eyfoto / Getty Images

13. Illinois: Champaign County
> Median age: 29.7 years (county), 37.7 years (state)
> Pop. under 18: 19.0% (county), 23% (state)
> Population: 207,946
> Life expectancy: 80.3 years
> County seat: Urbana

Source: Public Domain / Wikimedia Commons

14. Indiana: Tippecanoe County
> Median age: 28.1 years (county), 37.5 years (state)
> Pop. under 18: 20.7% (county), 23.9% (state)
> Population: 186,081
> Life expectancy: 79.1 years
> County seat: Lafayette

Source: EQRoy / Shutterstock.com

15. Iowa: Story County
> Median age: 25.9 years (county), 38.1 years (state)
> Pop. under 18: 16.9% (county), 23.4% (state)
> Population: 95,888
> Life expectancy: 82.1 years
> County seat: Nevada