Los Angeles County (incorporated as the County of Los Angeles) is a county in the U.S. state of California. As of 2010 U.S. Census, the county had a population of 9,818,605, making it the most populous county in the United States. Los Angeles County alone is more populous than 42 individual U.S. states. The county seat is the city of Los Angeles, the largest city in California and the second-largest city in the United States (after New York City).
Los Angeles County also includes two offshore islands, San Clemente Island and Santa Catalina Island.The county is home to 88 incorporated cities and many unincorporated areas. At 4083 sqmi (10574.9 km2), it is larger than the combined areas of the states of Rhode Island and Delaware.
The county is home to over a quarter of all California residents. One of the most diverse counties in the country, the county is home to the nation's largest urban Native American population. Within its boundaries are most of the principal cities composing the Los Angeles metropolitan area, and is the core of the five counties that make up the Greater Los Angeles Area.