Illinois - Criteria: A (event)
| Condon Brothers and R.H. Shumway Building |
| Cook County Criminal Court Building |
| Cook County Hospital Administration Building |
| Cook, John W., Hall |
| Cook Memorial Library |
| Coonley, Avery, School |
| Cornell Square |
| Coronado |
| Country Tea Room |
| Crane Company Building |
| Creamery Package Manufacturing Company Building |
| Crenshaw House |
| Crow Island School |
| Cumberland County Courthouse |
| Cumberland Presbyterian Church |
| Curtiss-Wright Aeronautical University Building |
| Curtiss-Wright Hangars 1 and 2 |
| Danville Branch, National Home for Disabled Volunteer Soldiers Historic District |
| Danville Public Library |
| Davis Square |
| Davis Theater |
| Dawson Brothers Plant |
| Dearborn Station |
| Decatur Downtown Historic District |
| Deerpath Hill Estates Historic District |
| Deerpath Inn |
| Delavan Commercial Historic District |
| Dell Rhea's Chicken Basket |
| Delta Kappa Epsilon Fraternity House |
| Delta Upsilon Fraternity House |
| Denhart Bank Building |
| Dickson Mounds |
| Dixon Downtown Historic District |
| Dorhmann-Buckman House |
| Downey Building |
| Downtown Aledo Historic District |
| Downtown East St. Louis Historic District |
| Downtown Hinsdale Historic District |
| Downtown Momence Historic District |
| Downtown Peotone Historic District |
| Downtown Plainfield Historic District |
| Downtown Quincy Historic District |
| Downtown Rock Island Historic District |
| Downtown Urbana Historic District |
| Dresden Island Lock and Dam Historic District |
| Dryden, George B., House |
| Duncan Mills Bridge |
| Dundee Township Historic District |
| Du Page County Courthouse |
| Du Quoin State Fairgrounds |
| Durant House |
| Durham-Perry Farmstead |
| Dwight Chicago and Alton Railroad Depot |
| Eagle Hotel |
| East Dubuque School |
| East Park Towers |
| East Ravenswood Historic District |
| East Rockford Historic District |
| East Village Historic District |
| Ebenezer Methodist Episcopal Chapel and Cemetery |
| Ebenezer Missionary Baptist Church |
| Edgar County Courthouse |
| Edison Park |
| Edwardsville Chapter House |
| Effingham County Courthouse |
| Egyptian Theatre |
| Eighth Regiment Armory |
| Eldorado City Hall |
| Elgin Academy |
| Elgin Downtown Commercial District |
| Elgin National Watch Company Observatory |
| Elgin Tower Building |
| Elliott Street Historic District |
| Elmwood Cemetery Gates |
| El Paso Public Library |
| Elsah Historic District |
| Eugene Field Park |
| Eureka College Administration and Chapel |
| Evanston Lakeshore Historic District |
| Evanston Ridge Historic District |
| Evanston Towers |
| Exchange Bank |
| Executive Mansion |
| Fairbanks, Morse and Company Building |
| Fairbury City Hall |
| Falconer Bungalow Historic District |
| Fall Creek Stone Arch Bridge |
| Farm Creek Section |
| Fehr, Charles, Round Barn |
| Felt, Cyrus, House |
| Field, Marshall, Garden Apartments |
| Fife Opera House |
| Fire Barn 5 |
| First Methodist Church of Batavia |
| First Presbyterian Church |
| First Self-Sustaining Nuclear Reaction, Site of |
| Fischer Theater |
| Fisher-Chapman Farmstead |
| Fithian House |
| Flamingo-On-The-Lake Apartments |
Data from United States Park Service and Wikidata
