There are 370 Fast Food Restaurants in San Francisco County, California, serving a population of 864,263 people in an area of 47 square miles. There is 1 Fast Food Restaurant per 2,335 people, and 1 Fast Food Restaurant per square mile.
In California, San Francisco County is ranked 18th of 58 counties in Fast Food Restaurants per capita, and 1st of 58 counties in Fast Food Restaurants per square mile.