Special Report

The 25 Most Populous Places in America

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5. San Diego County, California
> Total population: 3,286,069
> 1-yr. population change: -0.3% (-11,183 people)
> Largest place in county: San Diego

Source: Sean Pavone / iStock via Getty Images

4. Maricopa County, Arizona
> Total population: 4,496,588
> 1-yr. population change: +1.3% (+58,246 people)
> Largest place in county: Phoenix

Source: Sean Pavone / iStock via Getty Images

3. Harris County, Texas
> Total population: 4,728,030
> 1-yr. population change: -0.1% (-4,461 people)
> Largest place in county: Houston

Source: Gian Lorenzo Ferretti Photography / E+ via Getty Images

2. Cook County, Illinois
> Total population: 5,173,146
> 1-yr. population change: -1.7% (-89,595 people)
> Largest place in county: Chicago

Source: DutcherAerials / E+ via Getty Images

1. Los Angeles County, California
> Total population: 9,829,544
> 1-yr. population change: -1.6% (-159,621 people)
> Largest place in county: Los Angeles

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