Maricopa County Added More Residents Than Any Other in U.S.

Maricopa County grew more than any other county in the nation between 2016 and 2017, according to the latest U.S. Census Bureau estimates. The county added 73,650 residents, far more than 2nd-place Clark County, Nevada, which added 47,355 residents. Maricopa maintained its position from the previous year of 4th largest county in the nation.

On a percentage basis, however, Maricopa County was far below the 10 fastest-growing in the nation. Maricopa grew by 1.7 percent, whereas 10 other counties—mostly smaller ones—grew by 4.2 percent or more.

The census bureau sliced the stats several ways. Among metro areas, Phoenix-Mesa-Scottsdale came in at No. 4 in sheer number of new residents, growing by 88,772 in 2017 vs. 2016. Again, smaller cities dominated the growth on a percentage basis.


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The statistics, released today, were based on estimates as of July 1, 2017.

Top 10 Most Populous Counties: 2017

2017 Rank 2016 Rank County 2017 Population 2016 Population Numeric Change Percent Change
1 1 Los Angeles County, CA 10,163,507 10,150,558 12,949 0.1
2 2 Cook County, IL 5,211,263 5,231,356 -20,093 -0.4
3 3 Harris County, TX 4,652,980 4,617,041 35,939 0.8
4 4 Maricopa County, AZ 4,307,033 4,233,383 73,650 1.7
5 5 San Diego County, CA 3,337,685 3,317,200 20,485 0.6
6 6 Orange County, CA 3,190,400 3,177,703 12,697 0.4
7 7 Miami-Dade County, FL 2,751,796 2,736,543 15,253 0.6
8 8 Kings County, NY 2,648,771 2,650,859 -2,088 -0.1
9 9 Dallas County, TX 2,618,148 2,587,462 30,686 1.2
10 10 Riverside County, CA 2,423,266 2,386,522 36,744 1.5

Top 10 Largest-Gaining Counties (Numeric Increase): 2016-2017

2017 Rank 2016 Rank County 2017 Population 2016 Population Numeric Change Percent Change
1 1 Maricopa County, AZ 4,307,033 4,233,383 73,650 1.7
2 3 Clark County, NV 2,204,079 2,156,724 47,355 2.2
3 6 Riverside County, CA 2,423,266 2,386,522 36,744 1.5
4 2 Harris County, TX 4,652,980 4,617,041 35,939 0.8
5 5 Tarrant County, TX 2,054,475 2,021,746 32,729 1.6
6 4 King County, WA 2,188,649 2,155,962 32,687 1.5
7 8 Bexar County, TX 1,958,578 1,927,747 30,831 1.6
8 7 Dallas County, TX 2,618,148 2,587,462 30,686 1.2
9 12 Denton County, TX 836,210 808,299 27,911 3.5
10 14 Collin County, TX 969,603 942,453 27,150 2.9

Top 10 Most Populous Metropolitan Areas: 2017

2017 Rank 2016 Rank Metropolitan Area 2017 Population 2016 Population
1 1 New York-Newark-Jersey City, NY-NJ-PA 20,320,876 20,275,179
2 2 Los Angeles-Long Beach-Anaheim, CA 13,353,907 13,328,261
3 3 Chicago-Naperville-Elgin, IL-IN-WI 9,533,040 9,546,326
4 4 Dallas-Fort Worth-Arlington, TX 7,399,662 7,253,424
5 5 Houston-The Woodlands-Sugar Land, TX 6,892,427 6,798,010
6 6 Washington-Arlington-Alexandria, DC-VA-MD-WV 6,216,589 6,150,681
7 7 Miami-Fort Lauderdale-West Palm Beach, FL 6,158,824 6,107,433
8 8 Philadelphia-Camden-Wilmington, PA-NJ-DE-MD 6,096,120 6,077,152
9 9 Atlanta-Sandy Springs-Roswell, GA 5,884,736 5,795,723
10 10 Boston-Cambridge-Newton, MA-NH 4,836,531 4,805,942

Top 10 Largest-Gaining Metropolitan Areas (Numeric Increase): 2016-2017

2017 Rank 2016 Rank Metropolitan Area 2017 Population 2016 Population Numeric Change
1 1 Dallas-Fort Worth-Arlington, TX 7,399,662 7,253,424 146,238
2 2 Houston-The Woodlands-Sugar Land, TX 6,892,427 6,798,010 94,417
3 3 Atlanta-Sandy Springs-Roswell, GA 5,884,736 5,795,723 89,013
4 4 Phoenix-Mesa-Scottsdale, AZ 4,737,270 4,648,498 88,772
5 11 Washington-Arlington-Alexandria, DC-VA-MD-WV 6,216,589 6,150,681 65,908
6 6 Seattle-Tacoma-Bellevue, WA 3,867,046 3,802,660 64,386
7 13 Riverside-San Bernardino-Ontario, CA 4,580,670 4,523,653 57,017
8 8 Orlando-Kissimmee-Sanford, FL 2,509,831 2,453,333 56,498
9 9 Austin-Round Rock, TX 2,115,827 2,060,558 55,269
10 7 Tampa-St. Petersburg-Clearwater, FL 3,091,399 3,036,525 54,874
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