There are 107 Fast Food Restaurants in Marin County, California, serving a population of 260,814 people in an area of 521 square miles. There is 1 Fast Food Restaurant per 2,437 people, and 1 Fast Food Restaurant per 4 square miles.
In California, Marin County is ranked 22nd of 58 counties in Fast Food Restaurants per capita, and 11th of 58 counties in Fast Food Restaurants per square mile.