True morning magic. Empty streets and lots of parking! Who would think that this is part of the second largest city in the United States, with a population of 3,792,621 people? That is the census of 2010, but the real number of people living in the city of Los Angeles is most likely even bigger. LA county had a population of 9,818,605 for the 2010 census, which makes it the most populated county in the United States. It is more populated than 42 states together. People love LA, and so do we!