This Is The Most Populous Place in America

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By Douglas A. McIntyre Published
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This Is The Most Populous Place in America

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The grow rate of the American population slowed from 2010 to 2020. It rose only 7.4% to 331,449,281. The U.S. also became more urbanized. Almost 83% of Americans lived in urban areas.The center of population also continued to move further west, according to the Census. At the start of the 19th century, it was in Maryland. At the start of the 20th century, it had moved to Indiana, and last year, to was in Missouri.

The change in where most people live was largely due to the population growth rate in California, Arizona, and Texas. Two of the  five top counties by population are in California. One is in Texas. One is in Arizona and and one is in Chicago.

Using data from the U.S. Census Bureau, 24/7 Wall St. identified the most populous county in America. Counties we looked at ranked by their population as of July 1, 2021. Among the those, populations range from 1.5 million to nearly 10 million. These counties span the country, though only two are in the Midwest. The largest share of counties on this list are in the West, including eight in California alone. Most of the counties on this list either contain or have some or all of the same borders as a major city.

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Although each of the counties we reviewed rank among the largest in the U.S. by population, most have a smaller population now than they did one year ago. Housing prices in many of the most populous counties have soared in recent years. This has made them less affordable and led to rising outward migration. Falling birth rates and rising death rates during the pandemic have also contributed to population declines in these counties.

The most populous county in America is Los Angeles County, California. Here are the details:

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

Click here to read The 25 Most Populous Places in America

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Photo of Douglas A. McIntyre
About the Author Douglas A. McIntyre →

Douglas A. McIntyre is the co-founder, chief executive officer and editor in chief of 24/7 Wall St. and 24/7 Tempo. He has held these jobs since 2006.

McIntyre has written thousands of articles for 24/7 Wall St. He is an expert on corporate finance, the automotive industry, media companies and international finance. He has edited articles on national demographics, sports, personal income and travel.

His work has been quoted or mentioned in The New York Times, The Wall Street Journal, Los Angeles Times, The Washington Post, NBC News, Time, The New Yorker, HuffPost USA Today, Business Insider, Yahoo, AOL, MarketWatch, The Atlantic, Bloomberg, New York Post, Chicago Tribune, Forbes, The Guardian and many other major publications. McIntyre has been a guest on CNBC, the BBC and television and radio stations across the country.

A magna cum laude graduate of Harvard College, McIntyre also was president of The Harvard Advocate. Founded in 1866, the Advocate is the oldest college publication in the United States.

TheStreet.com, Comps.com and Edgar Online are some of the public companies for which McIntyre served on the board of directors. He was a Vicinity Corporation board member when the company was sold to Microsoft in 2002. He served on the audit committees of some of these companies.

McIntyre has been the CEO of FutureSource, a provider of trading terminals and news to commodities and futures traders. He was president of Switchboard, the online phone directory company. He served as chairman and CEO of On2 Technologies, the video compression company that provided video compression software for Adobe’s Flash. Google bought On2 in 2009.

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