All - Architectural style - Renaissance Revival architecture
| Columbia Southern Hotel |
| Commandant's Quarters |
| Commercial and Savings Bank |
| Commercial Building |
| Common Street District |
| Community Hospital |
| Comstock Hall |
| Concordia German Evangelical Church and Rectory |
| Concord Village Historic District |
| Condit House |
| Confidence Hall |
| Congress Theater |
| Conover Building |
| Convent de Bon Secours |
| Cooperstown Historic District |
| Copcutt,John,Mansion |
| Corby Farm Complex |
| Cork Hill District |
| Costen House |
| Cottage, The |
| Cotton Theater |
| Cottonwood County Courthouse |
| Couch-Artrip House |
| Coulby, Harry, Mansion |
| Coursey, Thomas B., House |
| Court Square Historic District |
| Court Street Firehouse |
| Covington County Courthouse and Jail |
| Covington House |
| Cowan, McClung and Company Building |
| Cox, Carrie Gaulbert and Attilla Cox, Jr., House |
| Cox, George B., House |
| Cox, Jacob D., House |
| Cox, Richard, House |
| Cox-Williams House |
| Cozad, Justus L., House |
| Cranch School |
| Crandall Farm Complex |
| Crawford-Gilpin House |
| Crawford, John Minor, House |
| Crego, Mrs.. I.L., House |
| Crenshaw House |
| Crim, J. N. B., House |
| Crittenden Farm |
| Critz, Thomas L., House |
| Crocker, E. B., Art Gallery |
| Croll Building |
| Crompton Loom Works |
| Cross Roads Church |
| Crowley School |
| Crown Point Courthouse Square Historic District |
| Crozer, George K., Mansion |
| Culbertson, William, House |
| Cummings, E. B., House |
| Cummins, John R., Farmhouse |
| Cummins School |
| Cunningham-Hevener House |
| Curtiss, Harlow C., Building |
| Customhouse and Post Office |
| Cuvier Press Club |
| Dahlgren, Lucy Drexel, House |
| Dakota Apartments |
| Dall, Andrew, Jr. and James, Houses |
| Dallas Mill |
| Daniel Pratt Historic District |
| Danielson Main Street Historic District |
| Danville Public Library |
| Danville Southern Railway Passenger Depot |
| Darke County Courthouse, Sheriff's House, And Jail |
| Davenport Hotel |
| Davenport Water Co. Pumping Station No. 2 |
| Davis, Robert S., House |
| Dawley House |
| Dawson, T. H. B., House |
| Dayton Arcade |
| Dayton House |
| Dayton Street Historic District |
| Decatur County Courthouse |
| Deer Hill |
| Delanson Historic District |
| Delaware Avenue Historic District |
| Delaware County Courthouse |
| Delaware County National Bank |
| Delaware, Lackawanna & Western Railroad Station |
| Delong, Zopher, House |
| Delta Upsilon Chapter House |
| Denton, George W., House |
| Denver and Rio Grande Railroad Station |
| Denver Orphans' Home |
| Dermon Building |
| Des Moines Saddlery Company Building |
| Dessaint, Marie Clare, House |
| Dessert, Joseph, Library |
| Detroit-Leland Hotel |
| Deuscher, Henry P., House |
| Dewey, Chester, School No. 14 |
| DeWitt, W.F., Hotel |
| Dexter Avenue Baptist Church |
| Dick House |
| Dickinson Branch Library |
Data from United States Park Service and Wikidata
