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The 100 most populous counties are highlighted, with counties having more than one million residents in orange and counties having fewer than one million residents in green, based on the results of the April 1, 2020 United States census.
US County Population Trends. Largest Counties. According to the most recent United States Census, Los Angeles County in California is the largest county in the nation, with a total population of 10,150,558 – an increase of 3.5% since 2010.
Annual and Cumulative Estimates of Resident Population Change for Counties and County Rankings: April 1, 2020 to July 1, 2023 (CO-EST2023-CHG-01)
This is the number of counties and county-equivalents for each state, the District of Columbia, the 5 inhabited territories of the United States, and the U.S. Minor Outlying Islands. Texas has 254 counties, the most of any state. Delaware has three counties, the fewest of any state.
The following is a sortable table of the most populous county in each U.S. state, federal district, and territory. Counties and states/territories in bold have a population of at least 1 million.
This statistic shows the 25 largest counties in the United States in 2022, by population. In 2022, about 9.72 million people were estimated to be living in Los Angeles County, California.
This is a list of the 100 most populous counties in the United States based on the national decennial US census conducted on April 1, 2020 and vintage Census population estimates for July 1, 2021. Many of the counties on the list include major cities or metropolitan areas in all parts of the United States.
