South Dakota: Todd County
> Median age: 23.8 years (state: 37.0 years)
> Population under 18: 41.8% (state: 24.6%)
> Population 65 and over: 7.4% (state: 16.3%)
> Total population: 10,195
> Largest place in county: Rosebud

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Tennessee: Montgomery County
> Median age: 30.8 years (state: 38.7 years)
> Population under 18: 26.9% (state: 22.4%)
> Population 65 and over: 9.1% (state: 16.0%)
> Total population: 200,180
> Largest place in county: Clarksville
Texas: Brazos County
> Median age: 26.5 years (state: 34.6 years)
> Population under 18: 20.6% (state: 26.0%)
> Population 65 and over: 8.9% (state: 12.3%)
> Total population: 222,981
> Largest place in county: College Station

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Utah: Utah County
> Median age: 24.8 years (state: 30.8 years)
> Population under 18: 33.8% (state: 29.8%)
> Population 65 and over: 7.6% (state: 10.8%)
> Total population: 605,490
> Largest place in county: Provo

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Vermont: Chittenden County
> Median age: 36.5 years (state: 42.9 years)
> Population under 18: 17.9% (state: 18.7%)
> Population 65 and over: 14.6% (state: 18.8%)
> Total population: 162,646
> Largest place in county: Burlington
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