What Are the Most Populous Counties in California?


Quick Answer

Four of the 10 most populous counties in the United States are located in California, including Los Angeles County, San Diego County, Orange County and Riverside County. Los Angeles County is ranked highest and is the largest county in the United States.

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Full Answer

According to the 2010 census, almost 10 million people live in Los Angeles County. San Diego County and Orange County each had just over three million people as of the 2010 census. Riverside County had just over 2.1 million residents. Other large counties in California include San Bernardino County and Santa Clara County, both of which are among the 20 largest counties in the United States.

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