population, or nearly 2 out of every 3 Americans, live in the red line, known as the 100 Mile Zone. To find census tract numbers for Pittsburgh area neighborhoods and communities, see the Allegheny County Census Tracts, 2000-2020 and the Pittsburgh Census Tracts, 1940-2020 pages of this guide. is 332 million (2020), and the country ranks 146th in population density (87 pop/mi2 or 34 pop/km2). From 1990 to 2000, in fact, population growth in the United States was nearly 33 million and population density increased from 70.4 to 79.7.
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