There are 719 Fast Food Restaurants in King County, Washington, serving a population of 2,118,119 people in an area of 2,115 square miles. There is 1 Fast Food Restaurant per 2,945 people, and 1 Fast Food Restaurant per 2 square miles.
In Washington, King County is ranked 21st of 39 counties in Fast Food Restaurants per capita, and 1st of 39 counties in Fast Food Restaurants per square mile.