There are 154 Post Offices in Maricopa County, Arizona, serving a population of 4,155,501 people in an area of 9,198 square miles. There is 1 Post Office per 26,983 people, and 1 Post Office per 59 square miles.
In Arizona, Maricopa County is ranked 15th of 15 counties in Post Offices per capita, and 1st of 15 counties in Post Offices per square mile.