There are 1325 Fast Food Restaurants in San Diego County, California, serving a population of 3,283,665 people in an area of 4,206 square miles. There is 1 Fast Food Restaurant per 2,478 people, and 1 Fast Food Restaurant per 3 square miles.
In California, San Diego County is ranked 23rd of 58 counties in Fast Food Restaurants per capita, and 9th of 58 counties in Fast Food Restaurants per square mile.