What are the districts of Los Angeles in the United States

Los Angeles" has three geographic concepts: 1, the greater Los Angeles region, including Los Angeles County, Orange County, Riverside County, and other five counties, 131 cities, population of 9.52 million, is the largest urban agglomeration in the United States; 2, the County of Los Angeles, consisting of 88 cities; 3, the City of Los Angeles, the second-largest city in the United States, population of 3.96 million.