“The flag uses five colors;
The large parts of green are used to show how cook county, outside of Chicago, is a large plains area, where farms and the rural areas are.
The two thin stripes of light pale yellow are to show the production of wheat that you would see once you head into the rural and suburbs of cook county.
The two light grey stripes are for the railway that connects the county to the biggest city, and vice versa.
Finally, the Blue stands for lake Michigan and how cook county borders the large body of water.
The white seven-pointed star is to show where the biggest city in cook county resides, Chicago, with the seven points each representing different ideals of the city and the county as a whole; Democracy, Education, Health, Construction, Commerce, Religion, and the People.”