| Cook | 1992 River West Gas Fires | 07/01/2008 |
| Cook | Battle of Fort Dearborn | 08/01/2009 |
| Cook | Bertha Van Hoosen, M.D. | 01/01/1992 |
| Cook | Bloom High School | 05/01/1991 |
| Cook | Brunswick Corporation Headquarters | 06/20/1995 |
| Cook | Burial Site of Josette Beaubien | 05/21/2006 |
| Cook | Camp Douglas | 10/20/2014 |
| Cook | Camp Thornton #2605 and the Civil Conservation Corps, Camp Motto: “String Along” | 05/01/2010 |
| Cook | Chicago Portage, The | 03/01/2009 |
| Cook | Dixie Highway, The | 05/01/2003 |
| Cook | Eastland Disaster, The | 06/04/1989 |
| Cook | Freedom Seekers and the Underground Railroad: Ton Farm Site | 09/24/2023 |
| Cook | Green Bay Trail, The | 04/28/1963 |
| Cook | Haymarket Riot (Missing) | 10/10/1970 |
| Cook | Hoxie Farm/Wampum Lake | 09/28/2019 |
| Cook | John H. Humphrey Home | 03/01/2007 |
| Cook | Kennicott House | 01/01/1978 |
| Cook | Mary Bartelme, Illinois’ First Female Judge | 07/01/2011 |
| Cook | Norway Building, The | 08/25/2018 |
| Cook | Origins of Calumet City and Abraham Lincoln Funeral Train | 05/31/2009 |
| Cook | River Forest, Illinois: Proud Heritage – Bright Future | 03/30/2013 |
| Cook | Stephen Arnold Douglas, 1813-1861 | 01/01/1963 |
| Cook | The Milwaukee Road | 06/26/2014 |
| Cook | Washington Park Racetrack | 10/28/2012 |
| Cook | West Side Grounds: Home Field of the Chicago National League Ball Club from 1893 to 1915 | 09/01/2008 |
