All - Constructed - 1910–1919
| Conant Creek Pegram Truss Railroad Bridge |
| Concord Haven |
| Concrete-Central Elevator |
| Condado Vanderbilt Hotel |
| Condon Brothers and R.H. Shumway Building |
| Confederate Mass Grave Monument in Somerset |
| Confederate Memorial Gateway in Hickman |
| Confederate Monument in Murray |
| Congregation Tifereth Israel |
| Connecticut Railway and Lighting Company Car Barn |
| Conover, Thomas J., House |
| Continental Hotel |
| Convenanter Church |
| Convention Hall |
| Conway County Library |
| Cooke Hydroelectric Plant |
| Coole Park Manor |
| Coolidge School |
| Coombs, Viola, House |
| Coon Box Fork Bridge |
| Cooper Hall |
| Cooper Library in Johnson Park |
| Corbusier, John William Creswell, House |
| Cornell Apartments |
| Cornell Pulpwood Stacker |
| Cornish House |
| Cosden Building |
| Costello, James C. and Mary A., House |
| Cotton Free Library |
| Cottonwood River Bridge |
| Cottonwood River Pratt Truss Bridge |
| County Line Bridge |
| Cox Ford Bridge |
| Cox Furniture Warehouse |
| Crane Company Building |
| Crane Motor Company Building |
| Cranmer House |
| Crater Lake Lodge |
| Creaser Building |
| Creek County Courthouse |
| Creek Masonic Lodge No. 226 |
| Crimmins, Thomas A., House |
| Crook County Bank Building |
| Cross Mountain Miners' Circle |
| Crozier, J.T. and Mollie, House |
| Crystal Theatre |
| Cullars Rotation |
| Cure Cottage at 43 Forest Hill Avenue |
| Curry, Lewis, House |
| Custer, George Armstrong, Equestrian Monument |
| Dahinden, Edward J., House |
| Dakota Club Library |
| Dalles Carnegie Library |
| Damon Hall |
| Damour, William and Sue, House |
| Daniel, Dr. James W., House |
| Daniel K. Inouye Kilauea Point Lighthouse |
| Daniels and Fisher Tower |
| Daniels County Courthouse |
| Daniels Farm House |
| Daniels School |
| Dansk Evangelical Lutheran Kirke |
| Darcelle XV |
| Davenport Apartments |
| Davidson Building |
| Davis, Jefferson, Monument |
| Davis Theater |
| Dayton Art Institute |
| Dayton State Bank |
| Dean, James Heber, House |
| Dean School |
| Deer Creek General Merchandise Store |
| DeGray Creek Bridge |
| Delavan Post Office |
| Delavan's Vitrified Brick Street |
| Delaware and Hudson Railroad Freight House |
| Deming Armory |
| Dendinger House |
| Denver and Rio Grande Railroad Station |
| Denver and Rio Grande Western Railway Depot |
| Des Moines River Bridge |
| DeSoto Parish Courthouse |
| Detroit Avenue Bridge |
| Detroit Edison Company Willis Avenue Station |
| Detroit Savings Bank Southwest Branch |
| Detroit-Superior High Level Bridge |
| Deuel County Courthouse and Jail |
| Deutsche Evangelisch Lutherische Zion Kirche |
| Devil's Lake State Park |
| Dewey Bridge |
| Dickey, Alfred, Free Library |
| Dickey-Birdsong Plantation |
| Dickman, A.P., House |
| Diller, Anna C., Opera House |
| Dillon County Courthouse |
| Dillon Memorial |
| District No. 132 School |
| Ditchrider House |
| Division Avenue-Plaster Creek Bridge |
| Dodge-Hamlin House |
Data from United States Park Service and Wikidata
