Los Angeles is the largest city in the state of California and the second largest in the United States. Los Angeles has an estimated population of 3.8 million and spans over 498.3 square miles (1,290.6 km2) in Southern California. Additionally, the Los Angeles metropolitan area is home to nearly 12.9 million residents. Los Angeles is the seat of Los Angeles County, the most populated and one of the most diverse counties in the United States. Los Angeles is one of the world's centers of business, international trade, entertainment, culture, media, fashion, science, technology, and education. It is home to renowned institutions covering a broad range of professional and cultural fields, and is one of the most substantial economic engines within the United States. As the home base of Hollywood, it is known as the "Entertainment Capital of the World", leading the world in the creation of motion pictures, television production and recorded music. The importance of the entertainment business to the city has led many celebrities to call Los Angeles and its surrounding suburbs home.