There are 150 Fast Food Restaurants in Sonoma County, California, serving a population of 500,943 people in an area of 1,576 square miles. There is 1 Fast Food Restaurant per 3,339 people, and 1 Fast Food Restaurant per 10 square miles.
In California, Sonoma County is ranked 41st of 58 counties in Fast Food Restaurants per capita, and 20th of 58 counties in Fast Food Restaurants per square mile.