According to the 2010 U. S. Census, Pennsylvania's most densely populated county is by far Philadelphia County, with 11,304 people per square mile.
Philadelphia County also has the largest population, 1,526,006. That's about 25% more than #2 Allegheny County.
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The Atlantic Coast is the most populated area of the Americas. Other majorly populated areas are the Pacific Coast, Central America, and the Gulf Coast.
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The least populated area of Australia would be almost anywhere in its deserts, which encompass most of the interior. Lack of fresh, drinkable water is the main reason for the absence of people.