Oregon - Area of significance: Architecture
| Columbia Southern Hotel |
| Comfort Station No. 68 |
| Comfort Station No. 72 |
| Commercial Club-Stuckey, S. C., Building |
| Commodore Hotel |
| Concord Building |
| Condon Commercial Historic District |
| Congress Apartments |
| Conser, Jacob, House |
| Cook, Amos, House |
| Cook, Jacob H. and Etna M., House |
| Cooley, George C., House |
| Cooley-Neff Warehouse |
| Coolidge, Orlando, House |
| Cooper, James S. and Jennie M., House |
| Coos Bay Carnegie Library |
| Coos Bay National Bank Building |
| Copple, Simpson, House |
| Coquille City Hall |
| Coquille River Life Boat Station |
| Coquille River Light |
| Corbett Brothers Auto Storage Garage |
| Corbett, Elliott R., House |
| Corbett, H. L. and Gretchen Hoyt, House |
| Corkish Apartments |
| Cornelius, Benjamin, Jr., House |
| Cornelius Hotel |
| Cornell, Albert B. and Mary, House |
| Corvallis Hotel |
| Costello, James C. and Mary A., House |
| Cotillion Hall |
| Cottage Grove Armory |
| Cottage Grove Downtown Commercial Historic District |
| Couch Family Investment Development |
| Court Street-Chemeketa Street Historic District |
| Cox-Williams House |
| Crandall, Louis A., House |
| Crater Lake Lodge |
| Crater Lake Superintendent's Residence |
| Craven, Joseph and Priscilla, House |
| Crook, Charles, House |
| Crook County Bank Building |
| Crosley, Harry A., House |
| Cross, Curtis, House |
| Cross, Harvey, House |
| Crumpacker, Maurice, House |
| Crum, Virgil and Beulah, House |
| Cumberland Apartments |
| Cumberland Presbyterian Church |
| Cunha, Joseph, Farmstead |
| Curry, Nathaniel, House |
| Cusick, Dr. William A., House |
| Cyrus, Henry and Mary, Barn |
| Dallas Downtown Historic District |
| Dalles Carnegie Library |
| Damascus School |
| Dana, Marshall, House |
| Daue, Alexander, House |
| Davidson-Childs House |
| Davidson, Dr. John E. and Mary D., House |
| Davis Block |
| Davis, John and Magdalena, Farm |
| Dawson, Alfred, House |
| Day Building |
| Dayton Apartment Building |
| Dayton High School |
| Dead Indian Soda Springs Shelter |
| Deady Hall |
| Deedon, Ed and Genevieve, Homestead |
| Deere, John, Plow Company Building |
| DeGuire-Ludowitzki House |
| DeGuire, Murton E. and Lillian, House |
| DeHart, Edward J., House |
| Deidrich Building |
| Dekum, The |
| Delaney-Edwards House |
| Del Rey Apartments |
| Depoe Bay Ocean Wayside |
| Dibble, Horace L., House |
| Dickson, Henry B., House |
| Diehl-Seitters House |
| Digman-Zidell House |
| Dimmick-Judson House |
| Doernbecher, Frank Silas, House |
| Domes, Walter J., House |
| Dooly, Frank E., House |
| Dorchester House |
| Doriot-Rider Log House |
| Dorris Apartments |
| Dosch, Henry E., House |
| Dosch, Henry E., Investment Property |
| Double-O Ranch Historic District |
| Douglas Building |
| Downing Building |
| Doyle, A. E., Cottage |
| Drain, Charles D., Jr., House |
| Drake, June D., House |
| Drake Park Neighborhood Historic District |
| Driver, E. Raymond, House |
| Druhot, Alice, House |
Data from United States Park Service and Wikidata
