All - Constructed - 1900–1909
| Cate House |
| Cates, Charles F. and Howard, Farm |
| Cathedral Basilica of the Assumption |
| Cathedral of the Madeleine |
| Cathedral of the Sacred Heart |
| Cathedral Valley Corral |
| Catherine Lake Historic District |
| Catholic-Protestant Chapels, Veterans Administration Center |
| Catlin Bridge |
| Cavanah, C. C., House |
| Caxton Building |
| Cedar Fort School |
| Cemetery Patent 110 |
| Centenary Methodist Church |
| Centennial Park |
| Central Fire Station |
| Central High School |
| Central Public Library |
| Central School |
| Chamber of Commerce Building |
| Champ's Ford Bridge |
| Chance, Albert Bishop, House and Gardens |
| Chandler Bookstore |
| Chapel of the Transfiguration |
| Chapman Creek Pratt Truss Bridge |
| Chapman, J. M., House |
| Chappaqua Railroad Depot and Depot Plaza |
| Chattooga County Courthouse |
| Chautauqua Auditorium |
| Chesapeake and Ohio Depot |
| Chicago and North Western Office Building/Passenger Depot-Lake City |
| Chicago and North Western Railroad Depot |
| Chicago, Milwaukee, St. Paul and Pacific Railroad: South Cle Elum Yard |
| Chicago, Milwaukee & St. Paul Depot-Jefferson |
| Chicago Northwestern Depot |
| Chicago Sanitary and Ship Canal Historic District |
| Chicago, St. Paul, Minneapolis and Omaha Railroad Passsenger Station |
| Chicago, St. Paul, Minneapolis, and Omaha Turntable |
| Chicago Telephone Company Kedzie Exchange |
| Chick, Tom, House |
| Chief Menominee Memorial Site |
| Children's Hospital |
| Childs-Irving Hydroelectric Facilities |
| Christ Cathedral |
| Christ Church Cathedral and Parish House |
| Christ Church New Brighton (Episcopal) |
| Christensen, Paul C., House |
| Christ Episcopal Church Complex |
| Christ Evangelical Lutheran Church |
| Christiansen, Jens Otto, House |
| Christie, Dr. George R., House |
| Church, Benjamin, House |
| Churchill, Richard, House |
| Church of Saint Mary the Virgin and Greeley Grove |
| Church of St. Bernard-Catholic |
| Church of St. Bridget-Catholic |
| Church of St. Casimir-Catholic |
| Church of St. Lawrence |
| Church of St Mary's-Catholic |
| Church of St. Wenceslaus-Catholic |
| Church of the Immaculate Conception-Catholic |
| Church of the New Jerusalem |
| Cincinnati, Richmond, & Muncie Depot |
| Circle Cross Ranch Headquarters |
| Citizen's and Southern Bank Building |
| Citizens State Bank of Gillett |
| City Market |
| City Square Park Bandstand |
| Clapp-Cunningham Building |
| Clark County Library |
| Clark, Sen. Joseph O., House |
| Clarkson Bridge |
| Clarkston Tithing Granary |
| Clarksville High School |
| Clay Building |
| Clay County Courthouse |
| Clay County Courthouse |
| Clay Street Cemetery (AHRS Site No. FAI-164) |
| Clegg, Peter, House |
| Cleveland Trust Company |
| Cliffs Ranger Station |
| Cliff, Z. E., House |
| Clinton AME Zion Church |
| Clutts House |
| CM and StP Railroad Underpass |
| Coddington School |
| Coe House |
| Coggon Public School |
| Coghlan Castle |
| Cohn, Arthur B., House |
| Coker Experimental Farms |
| Cold Springs Ranch House |
| Cole, Arthur W., and Chloe B., House |
| Coleman, James W., House |
| Cole School and Gymnasium |
| Colgan, Arthur and Ellen, House |
| College Park Airport |
| Colman House |
| Colonial National Bank Building |
| Colonnade Hotel |
Data from United States Park Service and Wikidata
