There are 122 Post Offices in San Bernardino County, California, serving a population of 2,121,220 people in an area of 20,052 square miles. There is 1 Post Office per 17,387 people, and 1 Post Office per 164 square miles.
In California, San Bernardino County is ranked 45th of 58 counties in Post Offices per capita, and 46th of 58 counties in Post Offices per square mile.