The Youngest County in Every State

New Mexico: Roosevelt County
> Median age: 30.0 years (state: 37.8 years)
> Population under 18: 24.4% (state: 23.3%)
> Population 65 and over: 13.9% (state: 16.9%)
> Total population: 18,888
> Largest place in county: Portales

New York: Tompkins County
> Median age: 31.1 years (state: 38.8 years)
> Population under 18: 14.9% (state: 21.0%)
> Population 65 and over: 13.9% (state: 16.1%)
> Total population: 102,642
> Largest place in county: Ithaca

North Carolina: Onslow County
> Median age: 26.4 years (state: 38.7 years)
> Population under 18: 24.4% (state: 22.4%)
> Population 65 and over: 8.9% (state: 15.9%)
> Total population: 195,069
> Largest place in county: Jacksonville

North Dakota: Sioux County
> Median age: 28.2 years (state: 35.1 years)
> Population under 18: 35.9% (state: 23.2%)
> Population 65 and over: 7.8% (state: 14.9%)
> Total population: 4,373
> Largest place in county: Cannon Ball

Ohio: Athens County
> Median age: 29.6 years (state: 39.4 years)
> Population under 18: 14.7% (state: 22.4%)
> Population 65 and over: 12.6% (state: 16.7%)
> Total population: 65,917
> Largest place in county: Athens