The Cook County Board of Commissioners is a legislative body made up of 17 commissioners who are elected by district, and a president who is elected county-wide, all for four-year terms. Cook County, which includes the City of Chicago, is the United States' second-largest county with a population of 5.2 million residents. The county board sets policy and laws for the county regarding property, public health services, public safety, and maintenance of county highways. It is presided over by its president, currently Toni Preckwinkle.