The Youngest County in Every State

Massachusetts: Suffolk County
> Median age: 32.8 years (state: 39.5 years)
> Population under 18: 16.8% (state: 20.0%)
> Population 65 and over: 11.8% (state: 16.2%)
> Total population: 796,605
> Largest place in county: Boston

Michigan: Isabella County
> Median age: 28.1 years (state: 39.7 years)
> Population under 18: 17.4% (state: 21.9%)
> Population 65 and over: 12.2% (state: 16.7%)
> Total population: 70,688
> Largest place in county: Mount Pleasant

Minnesota: Blue Earth County
> Median age: 31.0 years (state: 38.0 years)
> Population under 18: 19.8% (state: 23.3%)
> Population 65 and over: 13.4% (state: 15.4%)
> Total population: 66,795
> Largest place in county: Mankato

Mississippi: Oktibbeha County
> Median age: 26.1 years (state: 37.5 years)
> Population under 18: 17.4% (state: 23.9%)
> Population 65 and over: 11.0% (state: 15.4%)
> Total population: 49,512
> Largest place in county: Starkville

Missouri: Pulaski County
> Median age: 27.6 years (state: 38.6 years)
> Population under 18: 22.0% (state: 22.6%)
> Population 65 and over: 8.3% (state: 16.5%)
> Total population: 52,425
> Largest place in county: Fort Leonard Wood