25. Suffolk County, New York
> Total population: 1,526,344
> 1-yr. population change: +0.1% (+2,245 people)
> Largest place in county: Brentwood
Source: benedek / E+ via Getty Images
24. Philadelphia County, Pennsylvania
> Total population: 1,576,251
> 1-yr. population change: -1.5% (-24,754 people)
> Largest place in county: Philadelphia
Source: GCShutter / E+ via Getty Images
23. New York County, New York
> Total population: 1,576,876
> 1-yr. population change: -6.6% (-110,958 people)
> Largest place in county: Manhattan (NYC)
Source: Brandon Williams / iStock via Getty Images
22. Sacramento County, California
> Total population: 1,588,921
> 1-yr. population change: +0.2% (+2,680 people)
> Largest place in county: Sacramento
Source: DenisTangneyJr / iStock via Getty Images
21. Middlesex County, Massachusetts
> Total population: 1,614,742
> 1-yr. population change: -0.9% (-14,680 people)
> Largest place in county: Lowell
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