All - Architectural style - Neoclassical architecture
| Community Building |
| Community Theatre |
| Compton Building |
| Comstock-Cheney Hall |
| Conn, Charles Gerard, Mansion |
| Connelly, Clifford B., Trade School |
| Conner, Wesley O., House |
| Connor House |
| Consistory Building No. 2 |
| Constitution Hall |
| Continental and Commercial National Bank |
| Contra Costa County Hall of Records |
| Converse-Dalton House |
| Converse-Jackson Township Public Library |
| Conway County Courthouse |
| Conway Post Office |
| Conway Public Library |
| Cook Building |
| Cook County Courthouse |
| Cook, Joseph, House |
| Cook Memorial Library |
| Cook, Roland E., Elementary School |
| Cook's Hotel |
| Coolidge School |
| Cooper Library in Johnson Park |
| Coor-Bishop House |
| Coos Bay National Bank Building |
| Copley, Col. Ira C., Mansion |
| Corbin Bank Building |
| Corder Building |
| Cornell Apartments |
| Corregimiento Plaza Theater |
| Corsicana Commercial Historic District |
| Cossitt, Frederick H., Memorial Hall |
| Cottage Grove Avenue Presbyterian Church |
| Cotton County Courthouse |
| Cottonwood County Courthouse |
| Council Grove Carnegie Library |
| Country Club Hill Historic District |
| Covent Hotel |
| Covington County Courthouse |
| Covington House |
| Coweta County Courthouse |
| Cramond |
| Crane Company Building |
| Crawford County Courthouse |
| Crawford, David, House |
| Creasy, Thomas Claiborne, House |
| Creek County Courthouse |
| Creek Masonic Lodge No. 226 |
| Crescent Warehouse Historic District |
| Crestwood |
| Crim, Elias and Mattie, House |
| Crookston Carnegie Public Library |
| Crowell, C. C., Jr., House |
| Crown Cleaning and Dyeing Company Building |
| Cuero Commercial Historic District |
| Cumberland County Courthouse |
| Cumberland Presbyterian Church |
| Cumberland Public Library |
| Cumberland YMCA |
| Currituck County Courthouse and Jail |
| Curtis, Alice Ghormley, House |
| Curtis, Elijah P., House |
| Curtis Memorial Library |
| Curtiss-Wright Aeronautical University Building |
| Cypress Lodge |
| Dade County Courthouse |
| Dahle, Herman B. and Anne Marie, House |
| Dallam County Courthouse |
| Dallas County Courthouse |
| Danforth Memorial Library |
| Daniel Boone Hotel |
| Dansville Library |
| Danville Municipal Building |
| Darlington, Lyde Irby, House |
| Davenport Bank and Trust (Boundary Increase) |
| Davidson, Sarah, Apartment Block |
| Davie County Courthouse |
| Daviess County Courthouse |
| Davis Avenue Branch, Mobile Public Library |
| Davis, Dalton Holmes, Memorial Library |
| Davis Theater |
| Dawson Building |
| Dawson Carnegie Library |
| Day Street Public School |
| Dayton Methodist Episcopal Church |
| Decatur County Courthouse |
| Deerpath Inn |
| Delany Building |
| Delavan Post Office |
| Delaware Flats |
| Delaware, Lackawanna and Western Railroad Station |
| Delaware Public Library |
| Delaware Trust Building |
| Delgrado School |
| Delta Hotel |
| Denmark High School |
| Dennis High School |
| Depew High School |
Data from United States Park Service and Wikidata
