Largest counties in the U.S. 2018

This statistic shows the 25 largest counties in the United States in 2018, by population. In 2018, about 10.11 million people were living in Los Angeles County, California.

Additional information on urbanization in the United States

Urbanization is defined as the process by which cities grow or by which societies become more urban. Rural to urban migration in the United States, and around the world, is often undertaken in the search for employment or to enjoy greater access to services such as healthcare. The largest cities in the United States are steadily growing. Given their size, incremental increases yield considerable numerical gains as seen by New York increasing by 69,777 people in 2011, the most of any city. However in terms of percentage growth, smaller cities outside the main centers are growing the fastest with Frisco City being the fastest growing large city from 2016 to 2017.
Urbanization has increased slowly in the United States, rising from 79.76 percent of the population living in urban areas in 2004 to 81.67 percent in 2015. In 2018, the United States ranked 14th in a ranking of countries based on their degree of urbanization. Unlike fully urbanized countries such as Singapore and Hong Kong, the United States maintains a sizeable agricultural industry. Although technological developments have reduced demands for rural labor, labor in the industry and supporting services are still required.

The 25 largest counties in the United States in 2018, by population

CountyResident population in million
Los Angeles County, California 10.11
Cook County, Illinois 5.18
Harris County, Texas 4.7
Maricopa County, Arizona 4.41
San Diego County, California 3.34
Orange County, California 3.19
Miami-Dade County, Florida 2.76
Dallas County, Texas 2.64
Kings County, New York 2.58
Riverside County, California 2.45
Queens County, New York 2.28
King County, Washington 2.23
Clark County, Nevada 2.23
San Bernardino County, California 2.17
Tarrant County, Texas 2.08
Bexar County, Texas 1.99
Broward County, Florida 1.95
Santa Clara County, California 1.94
Wayne County, Michigan 1.75
Alameda County, California 1.67
New York County, New York 1.63
Middlesex County, Massachusetts 1.61
Philadelphia County, Pennsylvania 1.58
Sacramento County, California 1.54
Palm Beach County, Florida 1.49
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Release date

April 2019


United States

Survey time period


Supplementary notes

Population estimates.

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Statistics on "Demographics of the U.S. Part I"

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