San Francisco, officially the City of County of San Francisco, is the cultural, commercial, and financial center of Northern California.
The consolidated city-county covers an area of about 47.9 square miles (124 km2) at the north end of the San Francisco Peninsula in the San Francisco Bay Area. It is the fourth-most populous city in California, and the 13th-most populous in the United States, with a 2016 census-estimated population of 870,887.
The population is projected to reach 1 million by 2033.
Los Angeles, officially the City of Los Angeles and often known by its initials L.A., is the cultural, financial, and commercial center of Southern California. With a U.S. Census-estimated 2016 population of 3,976,322, it is the second most populous city in the United States (after New York City) and the most populous city in the state of California. Located in a large coastal basin surrounded on three sides by mountains reaching up to and over 10,000 feet (3,000 m), Los Angeles covers an area of about 469 square miles (1,210 km2).
The city is also the seat of Los Angeles County, the most populated county in the country. Los Angeles is the center of the Los Angeles metropolitan area, with 13,131,431 residents, and is part of the larger designated Los Angeles-Long Beach combined statistical area (CSA), the second most populous in the nation with a 2015 estimated population of 18.7 million.