Illinois - Significance region: National
| Nauvoo Historic District |
| New Masonic Building and Oriental Theater |
| New Philadelphia Town Site |
| Northwestern Terra Cotta Company Building |
| Oak Hill Cemetery |
| Oaklawn Farm |
| Old Cahokia Courthouse |
| Old Customhouse |
| Old Kaskaskia Village |
| Old Main, Knox College |
| Old State Capitol |
| Old Stone Arch, National Road |
| Old Stone Gate of Chicago Union Stockyards |
| Orchestra Hall |
| Orendorff, Ulysses G., House |
| Orr-Herl Mound and Village Site |
| Orth House |
| Oughton, John R., House |
| Paramount Theatre |
| Peoples Gas Building |
| Peoria Lock and Dam Historic District |
| Pettit Memorial Chapel |
| Pickwick Theater Building |
| Pleasant Home |
| Prairie Avenue District |
| Principia College Historic District |
| Promontory Apartments |
| Pullman Historic District |
| Pyle-National Company Plant |
| Quinn Chapel of the A.M.E. Church |
| Ragdale |
| Ratcliff Inn |
| Reagan's, Ronald, Boyhood Home |
| Reebie Moving and Storage Company |
| Reliance Building |
| Ridge Historic District |
| Riverbank Laboratories |
| River Forest Historic District |
| Riverside Landscape Architecture District |
| Robie, Frederick C., House |
| Robinson-Stewart House |
| Rock Island Arsenal |
| Rock Island National Cemetery |
| Rockwell Mound |
| Roloson, Robert, Houses |
| Rookery Building |
| Room 405, George Herbert Jones Laboratory, The University of Chicago |
| Roy, John, Site |
| Saline Springs |
| Schulze Baking Company Plant |
| Scott Field Historic District |
| Sears, Roebuck and Company Complex |
| Second Presbyterian Church |
| Shakespeare Garden |
| Shedd, John G., Aquarium |
| Soldier Field |
| South Dearborn Street-Printing House Row Historic District |
| South Loop Printing House District |
| South Shore Beach Apartments |
| South Side Community Art Center |
| Starved Rock |
| Starved Rock Lock and Dam Historic District |
| State Bank |
| Stevenson, Adlai E., II, Farm |
| Stevenson House |
| Stinson Memorial Library |
| St. Patrick's Roman Catholic Church |
| St. Thomas Church and Convent |
| Sylvan Road Bridge |
| Taft, Lorado, Midway Studios |
| Tallman, Horace M., House |
| Teich, Curt, and Company Building |
| Thomas, Frank, House |
| Tomek, F.F., House |
| Trumbull, Lyman, House |
| U-505 (IX C U-Boat) |
| Union Park Congregational Church and Carpenter Chapel |
| United States Post Office-Chicago |
| Unity Temple |
| University of Illinois Astronomical Observatory |
| University of Illinois Observatory |
| Urbana-Lincoln Hotel-Lincoln Square Mall |
| US ARMY Aircraft P-51D-25NA 44-73287 |
| USS SILVERSIDES (SS 236) National Historic Landmark |
| Ware Mounds and Village Site |
| Warm Air Research House |
| Washburne, Elihu Benjamin, House |
| Washington Park |
| Washington Park Historic District |
| Wells-Barnett, Ida B., House |
| Westclox Manufacturing Plant Historic District |
| Willard, Frances, House |
| Will County Historical Society Headquarters |
| Williams, Dr. Daniel Hale, House |
| Wilson Mounds and Village Site |
| Winslow, William H., House And Stable |
| Woman's Christian Temperance Union Administration Building |
| Wood, John, Mansion |
| Woodstock Opera House |
| Wright, Frank Lloyd, House and Studio |
Data from United States Park Service and Wikidata
