Largest Counties by Population

The 44 Largest Counties With a Population Above One Million

Los Angeles
Fresh snow blankets the mountains behind the downtown skyline after a series of storms that hammered northern California delivered much needed precipitation to the Greater Los Angeles Area January 7, 2008 in Los Angeles, California. Getty Images

Forty-three counties in the United States have a population greater than 1 million, ranked by population. The data for this list is based on mid-2016 population estimates from the United States Census Bureau. In 2010, only 39 counties in the United States had a population of more than 1 million, and Los Angeles County had fewer than 10 million residents. The top five list remains the same as in 2010.

 

From this list, you can see that although much of the country's population is concentrated in the megalopolis region of the Northeast, there is considerable population in the metropolitan regions of the Sun Belt from Texas to California. These heavily populated cities of Texas, Arizona and California continue to experience phenomenal growth as population declines in places like the Rust Belt continue. 

 

  1. Los Angeles County, CA - 10,116,705
  2. Cook County, IL - 5,246,456
  3. Harris County, TX - 4,441,370
  4. Maricopa County, AZ - 4,087,191
  5. San Diego County, California - 3,263,431
  6. Orange County, California - 3,145,515
  7. Miami-Dade County, Florida - 2,662,874
  8. Kings County, New York - 2,621,793
  9. Dallas County, Texas - 2,518,638
  10. Riverside County, California - 2,329,271
  11. Queens County, New York - 2,321,580
  12. San Bernardino County, California - 2,112,619
  13. King County, Washington - 2,079,967
  14. Clark County, Nevada - 2,069,681
  15. Tarrant County, Texas - 1,945,360
  1. Santa Clara County, California - 1,894,605
  2. Broward County, Florida - 1,869,235
  3. Bexar County, Texas - 1,855,866
  4. Wayne County, Michigan - 1,764,804
  5. New York County, New York - 1,636,268
  6. Alameda County, California - 1,610,921
  7. Middlesex County, Massachusetts - 1,570,315
  8. Philadelphia County, Pennsylvania - 1,560,297
  1. Suffolk County, New York - 1,502,968
  2. Sacramento County, California - 1,482,026
  3. Bronx County, New York - 1,438,159
  4. Palm Beach County, Florida - 1,397,710
  5. Nassau County, New York - 1,358,627
  6. Hillsborough County, Florida - 1,316,298
  7. Cuyahoga County, Ohio - 1,259,828
  8. Orange County, Florida - 1,253,001
  9. Oakland County, Michigan - 1,237,868
  10. Franklin County, Ohio - 1,231,393
  11. Allegheny County, Pennsylvania - 1,231,255
  12. Hennepin County, Minnesota - 1,212,064
  13. Travis County, Texas - 1,151,145
  14. Fairfax County, Virginia - 1,137,538
  15. Contra Costa County, California - 1,111,339
  16. Salt Lake County, Utah - 1,091,742
  17. Montgomery County, Maryland - 1,030,447
  18.  Mecklenburg County, North Carolina - 1,012,539
  19. Pima County, Arizona - 1,004,516
  20.  St. Louis County, Missouri - 1,001,876
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Rosenberg, Matt. "Largest Counties by Population." ThoughtCo, Feb. 12, 2018, thoughtco.com/largest-counties-by-population-1435134. Rosenberg, Matt. (2018, February 12). Largest Counties by Population. Retrieved from https://www.thoughtco.com/largest-counties-by-population-1435134 Rosenberg, Matt. "Largest Counties by Population." ThoughtCo. https://www.thoughtco.com/largest-counties-by-population-1435134 (accessed May 25, 2018).