County Commissioners are elected officials who oversee county activities and work to ensure that citizen concerns are met, federal and state requirements are fulfilled, and county operations run smoothly. The Cook County Board of Commissioners is the governing board and legislative body of the county. It is comprised of 17 Commissioners, each serving a four-year term and is elected from single member districts. Each district represents approximately 300,000 residents. The Board also operates approximately 40 committees and subcommittees chaired by members of Board of Commissioners.