Los Angeles,[a] often referred to by its initials L.A., is the most populous city in the U.S. state of California. With an estimated 3,820,914 residents within the city limits as of 2023,[8] it is the second-most populous city in the United States, behind only New York City; it is also the commercial, financial and cultural center of Southern California. Los Angeles has an ethnically and culturally diverse population, and is the principal city of a metropolitan area of 12.8 million people (2023). Greater Los Angeles, which includes the Los Angeles and Riverside–San Bernardino metropolitan areas, is a sprawling metropolis of over 18.3 million residents.