The Chicago City Council is the legislative branch of the government of the City of Chicago in Illinois. It consists of 50 alderpersons elected from 50 wards to serve four-year terms. The council is called into session regularly, usually monthly, to consider ordinances, orders, and resolutions whose subject matter includes code changes, utilities, taxes, and many other issues. The Chicago City Council Chambers are located in Chicago City Hall, as are the downtown offices of the individual alderpersons and staff.

The City Hall-County Building, commonly known as City Hall, is a 12-story building in Chicago, Illinois that houses the seats of government of the City of Chicago and Cook County. The building's west side holds the offices of the mayor, city clerk, and city treasurer; some city departments; offices of alderpersons of Chicago's 50 wards; and the Chicago City Council's chambers. The building's east side houses offices of the Government of Cook County, including the Cook County Board of Commissioners' chambers.