There are 428 Post Offices in Los Angeles County, California, serving a population of 10,105,722 people in an area of 4,058 square miles. There is 1 Post Office per 23,611 people, and 1 Post Office per 9 square miles.
In California, Los Angeles County is ranked 56th of 58 counties in Post Offices per capita, and 4th of 58 counties in Post Offices per square mile.