half of the US population lives in these 143 counties (ranked by population): Los Angeles County, California Cook County, Illinois Harris County, Texas Maricopa County, Arizona San Diego County ...
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These Arizona counties, on average, have the oldest and youngest residents. Here's whereHas Arizona's median age kept increasing? And which county is the oldest? Here's what to know. In 2023, the most recent year for which census data is available, the median age of Arizonans was 39. ...
Among the 15 counties on our list is Maricopa County, in the southwestern swing state of Arizona. Maricopa County, home to Phoenix, is the politically competitive heart of one of the key ...
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