There are 141 Post Offices in Orange County, California, serving a population of 3,155,816 people in an area of 791 square miles. There is 1 Post Office per 22,381 people, and 1 Post Office per 5 square miles.
In California, Orange County is ranked 52nd of 58 counties in Post Offices per capita, and 2nd of 58 counties in Post Offices per square mile.