Illinois - Criteria: A (event)
| Standard Oil Gasoline Station |
| Starr Hotel |
| Starved Rock Lock and Dam Historic District |
| Starved Rock Lodge and Cabins |
| State Bank |
| St. Charles Hospital |
| Stearns-Wadsworth House |
| Sterling Masonic Temple |
| Steuben Club, The |
| Stewart, Minnie, House |
| St. Ignatius College |
| Stillman's Run Battle Site |
| St. James Catholic Church and Cemetery |
| St. Louis, Peoria and Northern Railroad Depot |
| St. Luke's Hospital Complex |
| St. Nicholas Hotel |
| Stolp Island Historic District |
| Stolp Woolen Mill Store |
| Stone Arch Bridge |
| Stone Arch Bridge |
| Stoneleigh Manor |
| Stone Quarry Bridge |
| Stony Island Trust and Savings Bank Building |
| Story-Camp Rowhouses |
| St. Paulus Evangelisch Lutherischen Gemeinde |
| Strand Hotel |
| Streator Public Library |
| Streibich Blacksmith Shop |
| Studebaker Building |
| Sugar Creek Covered Bridge |
| Sunderlage Farm Smokehouse |
| Sutherland Hotel |
| Swedish American Telephone Company Building |
| Swedish Club of Chicago |
| Tallman, Horace M., House |
| Talman West Ridge Bungalow Historic District |
| Tartar's Ferry Bridge |
| Taylor Apartments |
| Taylorville Chautauqua Auditorium |
| Taylorville Courthouse Square Historic District |
| Teich, Curt, and Company Building |
| Thebes Courthouse |
| Thomas, Lewis H., House |
| Thompson Mill Covered Bridge |
| Tillery, Virginia, Round Barn |
| Town House, The |
| Tri-Taylor Historic District |
| Trobaugh-Good House |
| Trumbull Park |
| Tudor Manor |
| Turkey Hill Grange Hall |
| Turner Town Hall |
| U-505 (IX C U-Boat) |
| Union Lookout |
| Union Miners Cemetery |
| Union Station |
| Union Station |
| United States Post Office-Chicago |
| Unity Church |
| Unity Hall |
| University Apartments |
| University of Illinois Astronomical Observatory |
| University of Illinois Experimental Dairy Farm Historic District |
| Upper Alton Historic District |
| Uptown Square Historic District |
| Urbana-Lincoln Hotel-Lincoln Square Mall |
| Ursa Town Hall |
| US Army Aircraft C-53-DO-41-20124 |
| US ARMY Aircraft P-51D-25NA 44-73287 |
| Vandalia Statehouse |
| Vassar Swiss Underwear Company Building |
| Vermont Historic District |
| Vermont Masonic Hall |
| Vesta Accumulator Company Building |
| Vial, Robert, House |
| Victory Sculpture |
| Vienna Public Library |
| Villa Avenue Train Station |
| Village of Davis Junction Town Hall |
| Villa Historic District |
| Vine-Oakwood-Green Bay Road Historic District |
| Virginia Theater |
| Vriner's Confectionery |
| Wabash Avenue YMCA |
| Wabash Railroad Station and Railway Express Agency |
| Waller, William, House |
| Walnut Grove Farm |
| Warm Air Research House |
| Warren Commercial Historic District |
| Washington Park |
| Washington Park Historic District |
| Washington Square Historic District |
| Watseka Union Depot |
| Waukegan Public Library |
| Wayne Village Historic District |
| Weber, Robert, Round Barn |
| Weir, John, House |
| Welling-Everly Horse Barn |
| Wenner, Charles, House |
| West Argyle Street Historic District |
Data from United States Park Service and Wikidata
