Chicago is the largest city in the state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous city in the USA. Chicago is the county seat of Cook County, the second largest county in the United States by population.
The municipal flag of Chicago consists of two blue horizontal stripes on a field of white, each stripe one-sixth the height of the full flag, and placed slightly less than one-sixth of the way from the top or bottom, respectively. Between the two blue stripes are four red, six-pointed stars arranged in a horizontal row.