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Largest counties in the United States 2017

The 25 largest counties in the United States in 2017, by population (in millions)

The data displays the 25 biggest counties in the U.S. in 2017, by population. In 2017, about 10.16 million people were living in Los Angeles County, California.

Additional information on urbanization in the U.S. Urbanization is defined as the process by which cities grow or by which societies become more urban. Rural to urban migration in the U.S., and around the world, is often undertaken in the search for employment or to enjoy greater access to services such as healthcare. The biggest cities in the U.S. are steadily growing.

Los Angeles County, California 10.16
Cook County, Illinois 5.21
Harris County, Texas 4.65
Maricopa County, Arizona 4.31
San Diego County, California 3.34
Orange County, California 3.19
Miami-Dade County, Florida 2.75
Kings County, New York 2.65
Dallas County, Texas 2.62
Riverside County, California 2.42
Queens County, New York 2.36
Clark County, Nevada 2.2
King County, Washington 2.19
San Bernardino County, California 2.16
Tarrant County, Texas 2.05
Bexar County, Texas 1.96
Santa Clara County, California 1.94
Broward County, Florida 1.94
Wayne County, Michigan 1.75
New York County, New York 1.66
Alameda County, California 1.66
Middlesex County, Massachusetts 1.6
Philadelphia County, Pennsylvania 1.58
Sacramento County, California 1.53
Suffolk County, New York 1.49